EastEnders' Carol Jackson is "disgusted" with Kat Moon as she prepares to lie in court next week.
The Walford battleaxes will have a dramatic showdown when Carol (Lindsey Coulson) discovers that Kat (Jessie Wallace) has agreed to testify against her niece Alice Branning in the upcoming murder trial of Michael Moon.
Kat recently made a deal with Janine Butcher (Charlie Brooks) in exchange for the imprisoned villain to drop charges against her cousin Stacey Branning (Lacey Turner), who she falsely accused of stabbing her in 2010, resulting in Stacey fleeing the country.
A source told Inside Soap magazine: "Kat feels sick to her stomach about what she's agreed to do. But this is the only way to secure Stacey's freedom and she feels she has no choice. Obviously, Carol is disgusted."
Both Janine and Alice are charged with murdering Michael last October, but while Alice stabbed him - to come to the aid of Janine - it was Janine who finished the job, killing her husband.
Carol has recently been trying to rally support for Alice despite feeling unwell due to her own battle with breast cancer.
The insider added: "She's got enough on her plate having chemo for breast cancer, so the last thing Carol needs to be doing is getting into a scrap with Kat.
"But she doesn't want to lead her life any differently. Carol's a stubborn lady and if she thinks someone deserves an earful, she isn't going to hold back."

Ferne McCann has admitted she cheated on Charlie Sims with Frank Major.
'The Only Way is Essex' star revealed there was some "overlap" between her two relationships and regrets lying to Charlie about her romance with Frank.
She said: "It's true I cheated on Charlie before I split with him. I do regret lying about it but I thought I'd hurt Charlie more by telling him the truth."
The 23-year-old star began seeing Frank, 29, in December and realised her on/off relationship with Charlie wasn't meant to be despite briefly getting back together after Charlie cheated on her.
She told Britain's Star magazine: "When me and Charlie got back together after he cheated on me, things just didn't feel the same. There was a huge trust issue. I had always believed that we were the real done, I never thought he'd cheat. But he did and I just couldn't get over it.
"Frank was a gentle push to make me realise things weren't right between me and Charlie. He made me see that I didn't feel the same way about Charlie as I did before he cheated."
Despite her transgressions with Frank, Ferne insists it was Charlie, 21, who ruined their relationship.
She exclaimed: "People are calling me a liar and a cheat, but Charlie ruined our relationship. He betrayed me and shattered the trust."

Sam Bailey is pregnant.
The 2013 'X Factor' winner discovered she was expecting her third child after taking a pregnancy test in an ASDA supermarket and couldn't wait to tell her husband Craig.
The former prison officer told The Sun newspaper: "I went and did it in the toilet while he was getting all the food.
"I came out and went, 'Yep - I'm pregnant'. It wasn't planned."
Sam, who is ten weeks pregnant, has had to delay her tour, which was planned for October, and feared her management would be disappointed by the news.
She said: "When I got into the car I was really upset because I thought I'd let everyone at my management and the record label down.
"But they were really good about it. I was going to go on tour solo at the end of October - but I have to move it until January."
The songbird, who also has daughter Brooke, eight, and son Tommy, five, with Craig, 40, insists despite their initial shock, her and her husband are excited about the pregnancy.
She said: "He thinks it's a New Year's Eve baby and he could be right. I've always wanted three kids.
"Obviously I'm getting bigger. I didn't want people to think I'd just got far. That would make me feel insecure again."
Sam, who will release her debut album 'The Power Of Love' on March 24, revealed one of the first people she told was 'X Factor' mentor Sharon Osbourne.
She said: "I'm close to Sharon. We speak quite a lot. She's my confidante and has known about the pregnancy. She's been great."
The star also thinks she could give TV boss Simon Cowell a few tips, after his girlfriend gave birth to their first child, Eric, on Valentine's Day (14.02.14).
She quipped: "I hope I'll see him soon - I can teach him how to change a nappy."

Niall Horan is back with his ex-girlfriend Barbara Palvin.
The One Direction hunk, who split from the Victoria's Secret model in February after three months of dating, was spotted looking cosy with the brunette beauty at London's Shepherd's Bush Empire on Tuesday night (04.03.14) watching American boyband 5 Seconds Of Summer.
A source told The Sun newspaper: "Being either a working model or performer is incredibly difficult on a relationship.
"In either job you won't be in one place for more than a few days at a time.
"Add to that the fact Barbara lives in America and Niall's base is in London and you've got a logistical nightmare."
The source added: "Barbara's a lovely girl, though. She's completely down to earth and not vain at all, which is what Niall finds so appealing."
The pair first started dating after last year's 'X Factor' wrap party in December and they celebrated New Year's Eve at a pub in Hertfordshire, before breaking up before Valentine's Day.
The stunning model, 20, confirmed she had split from Niall by posting a photograph of herself and a new secret guy on her Instagram account, clutching a bunch of flowers, accompanied with the caption, "Early Valentine".
The Irish star, 20, who now appears to have got back together with the model, is on a break a three-month break after touring the world with his bandmates Harry Styles, Zayn Malik, Liam Payne and Louis Tomlinson.
After the show on Tuesday the Hungarian model and Niall made their way to nightclub Funky Buddha in Mayfair, where they were joined by 5 Seconds Of Summer and band mate Liam, who had been watching Beyonce in a box with Lily Allen at London's O2 Arena.

Jessica Simpson is happier than ever before.
The 33-year-old star, who will marry her fiancé Eric Johnson this year, admits she lost her confidence after gaining weight following the birth of their first child, 22-year-old daughter Maxwell, but managed to lose 50lbs after joining Weight Watchers.
Speaking in a new advert for the weight loss classes, she says: "When I started Weight Watchers, I didn't know what to expect at the meetings but I really love going, I do.
"It reminds me we don't have to do this alone. It's so much better to have some back up and to do it together because we all face similar challenges.
"The meetings keep me focused and motivated and I have a new found determination that I'm really proud of. I can honestly say I've never been happier!"
The singer, who also has eight-month-old son Ace, has set a date for her wedding to former NFL star Eric, 34, who she got engaged to in November 2010, and plans to stay in shape for her big day.
She told People magazine: "I think it's about time! Knowing that I have the wedding coming up is an incentive to stay on Weight Watchers, count my points and stay in the gym. I mean, when you see my dress, you'll know."
Meanwhile, the singer hasn't released new material since her 'Happy Christmas' album in 2010 and wants to start focusing on her career again.
The fashion mogul said: "I wanna sing again. I want my daughter to see me onstage. My fiancé has never even watched me perform. Which is crazy. That's my passion, that's my love, that's everything that I am."

Zack Snyder says the 'Man of Steel' sequel "explodes" the Superman and Batman universes.
The 48-year-old star - who is helming the follow-up to 2013's adventure - is excited about letting the iconic superheroes "lose" in the forthcoming film and is thrilled they're not tied to the "mythology" from which the characters originated.
Talking to the Los Angeles Times newspaper, he explained: "[The movie] literally takes the 'Man of Steel' and 'Batman' universes and explodes them. You're not as tied to the mythology. In 'Man of Steel', we had to create an origin story, a mythology, and there's a lot of energy into that, which we love doing. Don't get me wrong. But when you think about how fun it is too -- now that you've got these characters -- to now let 'em loose. That's fun!"
Snyder is "very excited" about the project, which will see Henry Cavill reprise his role as Superman alongside Ben Affleck as Batman, and plans to begin filming in the next few months.
He added: "We're getting ready to start shooting in a month or so. It's going great. I'm very excited. It's very fun to get into this world with different heroes coexisting in the same universe, but a lot of balls in the air as they say."

Alex Turner isn't sure young people know what rock 'n' roll is.
The Arctic Monkeys frontman insists his much-talked about BRIT Awards acceptance speech - in which he declared rock music will "never die" and issued a rallying call for guitar bands - was not meant to be "aggressive" but he genuinely felt some people needed educating.
He said: "It's not aggressive. It was just about presenting an option that people may or may not know exists. It occurred to me that in that room, or certainly watching it on TV, were people who'd never heard the term rock 'n' roll other than to describe a zip on a Topman leather jacket."
Alex is hopeful his "entertaining" speech will encourage more teenagers to form bands of their own.
He told NME magazine: "I don't see it as a personal victory but it seems in some way a victory for bands and the idea you can start a band with your mates and eventually go on to move people or whatever you wanna call it.
"Using rock 'n' roll as the most direct way of illustrating that was kinda what I was trying to do - and also to try and be entertaining at the same time.
"I feel it's better to present it that way, with a bit of colour, rather than like, 'You know, we started in my garage...' F**k that. And I can't go up there and behave like a yob, those days are gone. I can't just go up there and blow a raspberry any more."

Katie Holmes is in talks to launch her own reality show.
The 'Don't Be Afraid of the Dark' star has reportedly been plotting to reinvent herself as America's next domestic goddess in the vein of fellow actress Gwyneth Paltrow and is considering showing her life on the small screen.
A source told Grazia magazine: "Katie admires how Gwyneth Paltrow has carved out a foodie career. She's hoping this might be a great new direction for her. A number of prominent US cable networks are interested in the show, which will see Katie learning to make different dishes, as well as concentrating on catering for children."
The report comes after Katie, 35, posted pictures of herself with her designer pal Zac Posen learning how to make fresh pasta at Mario Batali's New York cookery school, Eataly.
It is thought Katie was getting advice from the top chef about her new show, especially since she only started to experiment in the kitchen two years ago.
The actress - who has seven-year-old daughter Suri with her ex-husband Tom Cruise - recently closed her clothing line, Holmes & Yang, and so has the time to begin a new project.

Katy Perry filmed her sister's birth on her mobile phone.
The 'Roar' hitmaker was by her older sibling Angela Hudson's side last week when she welcomed her little girl into the world, and although she helped deliver her niece 29-year-old pop star still managed to capture the moment on film.
Katy - real name Katherine Hudson - said: "My sister had a baby in her living room - very naturally, not one Advil. I was there kind of being an assistant doula and saw everything.
"We had dinner first, obviously before I saw it all. No, it was just there and it was an incredible experience.
"I was kind of like Martin Scorsese with my iPhone - I have the whole thing. It was like a water birth, the whole thing we're like 'The child is swimming through the water.' It's crazy."
After witnessing a live birth, Katy went on to hail mothers as "real rock stars".
The 'Dark Horse' singer - who recently split from boyfriend John Mayer after 18 months of dating and was previously married to Russell Brand - said: "It's insane, like birth and women giving birth - whenever I see moms walking down the street I'm like, 'Damn, you're a rock star, you're the real rock star - you did something incredible.' "
And Katy admitted her entire family are excited by the arrival of Angela's baby, especially her parents Keith and Mary Hudson.
Speaking on the Fifi & Dave Show on Australian radio station Fox FM, she said: "The baby girl is so alert and aware, and active and incredible. It's the first time in our family to have a little one so everyone's very excited."

Prince hates "strangers touching" his hair.
The 'Purple Rain' hitmaker admits he gets really angry when people he's not familiar with reach forward and try and feel his afro hairstyle without asking permission first.
When asked what his pet peeve was during a Q&A session on 'The Arsenio Hall Show' last night (05.03.14), he said: "Strangers touching my hair!"
The 55-year-old singer then went on to explain that he gets annoyed when people barge into him at a busy event.
Arsenio asked him when the last time he got mad was, to which he replied: "I got a little bit [mad] at a party I just went to after the Oscars. Folks have a tendency to want to bump into you, and it's mostly dudes."
The Q&A session on the US talk show was part of a rare special appearance from Prince, who agreed to perform a number of songs with his all-female band 3RDEYEGIRL and sit down for an interview with the host-turned-comedian to discuss his plans for 2014.
Prince's appearance was announced on the show last week, with a lookalike of the star delivering an envelope containing the news, which Arsenio read out to the audience.

Jennie Garth has suffered with severe anxiety since the age of 19.
The 41-year-old actress admits in her new tell-all memoir 'Deep Thoughts From a Hollywood Blonde' she regularly felt uneasy when carrying out simple tasks as a youngster and she used to shy away from people, so that they wouldn't talk to her.
In an extract obtained by E! News, she wrote: "I felt comfortable--almost comforted--by all of the workers buzzing around me during the day, but after hours, I'd find myself getting anxious when strangers approached me.
"And so simple tasks, like going to the grocery store, or the mall, or to get gas, became overwhelming exercises in having to be 'on' when my natural inclination was to shut down and not interact with anyone. I...began to suffer a level of anxiety that as, at times, nearly paralysing. When the panic attacks started to kick in, I became even more withdrawn."
Before long, the blonde beauty stopped doing "normal" things teenage girls did and would only leave her home when it was dark.
She explained: "[I] stopped going to the movies or clothes shopping or doing any of the other things normal young people do.
"I wouldn't say that I ever stepped over the line into full-blown agoraphobia, but I would say I definitely came close."

Sarah Jessica Parker never wears socks.
The 48-year-old actress doesn't like to cover her feet with clothing, even in freezing temperatures, because she believes showing off her ankles will create the illusion that she's taller than she really is.
Speaking on 'The Ellen DeGeneres Show' on Wednesday night (05.03.14), she said: "I don't wear socks, I never wear socks even in the dead of winter.
"I'm so short that I try to preserve a little bit of skin to show there is more to me than meets the eye."
The blonde beauty then went on to dismiss rumours that there will be a third 'Sex and the City' movie - which she played loveable character Carrie Bradshaw in - any time soon.
She explained: "I've tried to make up some interesting answers every time I've been asked this question lately.
"The truth of the matter is there has been no real conversation about a third movie at all."
However, Sarah Jessica did tease that there is more of the story to be told, but doesn't know if it'll ever get turned into another flick.
She said: "I know there is a story, but whether or not the story is ever told remains really one of the great mysteries of all time."