Kris Jenner reportedly feels Bruce Jenner's new girlfriend has driven a wedge between them.
The 58-year-old reality TV star, who split from the Olympic gold medallist last October after 23 years of marriage, has distanced herself from her estranged husband after discovering he is romancing her best friend, Ronda Kamihira.
A source said: "They're not fighting with each other over this, they're just not as close as they used to be.
"It made them realise that some space was best for everyone."
While 64-year-old Bruce - who has daughters Kendall, 18, and Kylie, 17, with Kris - is very happy to be dating again, the showbiz matriarch isn't ready to move on to another man yet.
The source told PEOPLE magazine: "She says she doesn't have time to date, so she hasn't even started wrapping her head around it. She's just not ready.
"Kris is devastated. This was her best friend of 20 years, and Bruce isn't really concerned with her feelings about it."
The former couple previously insisted they were still "very good friends" despite recently filing for divorce.

Noel and Liam Gallagher are on "good terms".
The brothers and former Oasis bandmates fell out in 2009 and are believed to have refrained from speaking to each other ever since but Noel has now revealed they have begun building bridges.
According to The Sun newspaper, he told the December issue of Q magazine: "We're on good terms, as good as we can be."
However, contrary to increasing speculation that they're planning to reunite for the 20th anniversary of Oasis' second album '(What's The Story) Morning Glory?', Noel insists there is no reunion on the cards.
He added: "I'm f**king looking forward to spoiling everybody's party next year. We won't be doing it."
Meanwhile, the 47-year-old rocker recently revealed that he is still good friends with his former bandmates Gem Archer, Andy Bell and Chris Sharrock - who joined his brother Liam's band Beady Eye after their falling out.
He said previously: "I was with some of Beady Eye the other night and they are still plugging away. They're good lads. We all got completely s**t-faced and we talked nonsense for hours. It was good."

Usher found being a vegan too expensive.
The 'Good Kisser' hitmaker has confessed he ditched the diet - on which you cannot eat meat or any other animal products - because he was spending too much money on maintaining it.
Referring to the private chef he had travel with him on tour, he said: "That was opulent as hell.
"It was just difficult to find people who can make vegan food taste great."
However, the 36-year-old star - who has sons Naviyd Ely Raymond and Usher Raymond V from his marriage to ex-wife Tameka Foster - is now following an even stranger food regime.
He explained to Billboard magazine: "These days, I try to eat for my blood type when I'm not eating for the fat kid inside me."
Quizzed on what he meant by eating for his blood type, he added: "A doctor I know came up with it, but hasn't released it yet, so I don't want to tell you too much about it.
"But the idea is to eat the foods that work best for your body. For my blood type the meats I can eat are pork, beef and fish."

Cheryl Fernandez-Versini says Louis Walsh is going deaf.
The 'Only Human' singer insists her fellow 'X Factor' judge has become hard of hearing since she re-joined the ITV talent show earlier this year and claims she, Mel B and Simon Cowell had to constantly repeat the names of those auditioning earlier this year.
She explained: "We went through stages where people would say, 'My name is Ben', and he would be like, 'Ken?' And we would be like, 'Ben!'
"We have told him he needs a hearing aid but I don't think it went down very well."
However, Louis has hit back at Cheryl, 31, by suggesting he damaged his hearing while listening to her music.
He told The Sun newspaper: "Maybe that's from listening to her records!
"Anything she can say I can hit back twice as hard."
The 62-year-old music manager - who mentored Cheryl and her Girls Aloud bandmates when they appeared on 'Popstars: The Rivals' in 2002 - went on to reveal that he hopes his colleague will perform her new single 'I Don't Care' on 'The X Factor' later this year.
Appearing to make a dig, he added: "I'd like to see her perform, singing and dancing. I hope she sings live. I'm sure she can."

Mark Wright became a man wen he met Michelle Keegan.
The former 'The Only Way Is Essex' star has confessed that although he always knew he wanted to fall in love, get married and have children, it wasn't until he met his fiancée that he decided to put his womanising ways behind him.
He explained: "I was only 23 when I did TOWIE and a bit of a party boy. I was still growing up. I would sleep in late and go out at night.
"But I always wanted to grow up and marry a woman that I love and respect then have kids.
"That chapter of my life is beginning. I guess I'm a man now."
However, the 27-year-old star - who was previously engaged to former co-star and on-off girlfriend of ten years Lauren Goodger - admits his hectic 'Strictly Come Dancing' training schedule means he hasn't been seeing as much of his wife-to-be as he'd like.
He told The Sun newspaper: "It's been so great living together but then Strictly started and everything went crazy.
"We've been taken away from each other a little bit.
"But Strictly is finishing at Christmas, as is the TV drama she's working on, so we're going to take January off, relax and get ready for next year's wedding."
Meanwhile, Mark and his professional dance partner Karen Hauer are set to perform the Samba to 'That's The Way I Like It' by KC and the Sunshine Band on tonight's show.

James Blunt "looks like Barbie" in his new music video.
The 40-year-old singer rides a horse in the promotional film for his new single 'When I Find Love Again' but says the animal's unusual colouring made for a less-than-masculine appearance for him in the footage.
He said: "The horse was albino and had really weird eyes. When it sweated, its hair became transparent, it's skin showed through and it turned pink. So my video is me riding round on a great big pink pony, like Barbie."
The 'You're Beautiful' hitmaker hadn't ridden a horse since leaving the army 12 years ago and admits he found shooting the video tough.
He added "Spending seven hours on a horse for the shoot was pretty funny actually.
"It was exhausting and quite painful. I wasn't walking too well the following day."
James released a new album, 'Moon Landing', earlier this year and admits he was thrilled by the response to the record, despite previously insisting he didn't care.
He told Britain's HELLO! magazine: "I was surprised by the success. When I was doing interviews, they asked if I cared about the chart placing and I would say no and that it was all about the artistic integrity and all that. But the reality is, I was lying to myself. Of course it mattered how well it did."

Hugh Jackman is worried about bleeding on stage during his upcoming Broadway play.
The Australian actor is getting ready to portray a man who brings his girlfriend to a remote rural cabin near a river to introduce her to night fishing in 'The River' later this month, and will have to clean, prepare and sauté a real trout on stage during every performance.
The 46-year-old star - who is married to Deborra-Lee Furness - said: "I love the idea of doing all that, in silence and alone, except I'm on stage in front of 750 people."
He added: "I love the power of theatre to create a moment like that - though if I cut myself and start bleeding all over the place it might not be so silent."
The 'Les Miserables' star is excited to be returning to the stage in Jez Butterworth's production, as even though he loves films, he relishes the chance to challenge himself.
Asked about performing live on stage, he said: "It's a love that's never waned since I was five, doing 'Camelot' at my primary school."
He added to the new US issue of Vogue magazine: "This play has been described as a piece of chamber music. I've done musicals and a one-man show and massive, bombastic movies, so it's thrilling to be in something so intimate and filled with so many goose-bump moments."

Ozzy Osbourne says Sharon Osbourne suffered "Exorcist"-like seizures during her treatment for cancer.
The Black Sabbath rocker has confessed he was terrified of losing his loyal wife when she was diagnosed with colon cancer in 2002 because she often suffered violent seizures.
He explained: "Sharon is the strongest woman I know. When I saw the scans of the colon, I thought, 'No way'. The cancer was so aggressive.
"She had three chemotherapies a month and after nine months the side-effects got worse and worse.
"She was having seizures - she was like The Exorcist, bouncing around the bed. I thought I was going to lose her.
"I thought it was all going to be too much for her. Then at the end of the nine months the doctor said, 'She's going to need nine months to get over the chemotherapy'. Her response was, I'm cancer free, great. I'm going shopping'."
However, despite 62-year-old Sharon - who had a double mastectomy in 2012 after learning she carried a gene that increased her risk of developing breast cancer - having won her battle against the disease, Ozzy, 65, is still worried about losing his wife.
He told The Sun newspaper: "I go to AA [Alcoholics Anonymous] meetings at a place close by every lunchtime. I didn't want to but I had to if I wanted to keep my family.
"It's hard. I had a therapist at first but that didn't work so I agreed to try AA."
Ozzy - who is now 19 months sober - added: "Alcoholism is an illness. I don't like going to the meetings but if I don't go I know I will drink again. And I worry about losing everything, so I just don't want to drink anymore."

Casper Smart says it's "hard" being Jennifer Lopez's ex-boyfriend.
The 27-year-old choreographer split from the 'Booty' singer - who he met while working as one of her backing dancers - earlier this year and has confessed it's difficult to get people to take him and his career seriously following the break-up.
He explained: "It's also hard being looked at as, 'You only had that job because you were the boyfriend'.
"So now, standing on the other side, people go, 'Oh, wow, he actually does this for this person, this person and this person'.
"And before Jennifer I did a lot of stuff with a lot of other big artists."
However, Casper - who choreographed the risqué dance moves for Nicki Minaj's controversial 'Anaconda' music video - insists he still keeps in touch with JLo and her twins, daughter Emme and son Maximilian, from her marriage to Marc Anthony.
He told Entertainment Tonight: "We're great friends. I love her and the kids and they're incredible."
Meanwhile, Casper has also come to the defence of his latest client, Ariana Grande, insisting she certainly didn't live up to her "diva" reputation.
He said: "I just did her new music video, 'Love Me Harder', so from the top to the bottom of the day I was right there next to her the whole day and she was sweet as pie."

Brad Pitt had never been on a plane until he was 25.
The 50-year-old actor - who raises children Maddox, 13, Pax, 10, Zahara, nine, Shiloh, eight and twins Knox and Vivienne, six, with wife Angelina Jolie - is keen for his kids to get an "education" by seeing as much of the world as possible while he and his spouse are working.
He said: "Travel is the best education there is. I had never been on a plane until I was 24 or 25 so when I started to travel abroad, whether it was to Netherlands or Tokyo or Belgium, it was all such an experience.
"Angie and I travel a lot for work and that's great but you're always on a schedule. So - especially with the kids - we always try to carve out days where we aren't working where we experience more of the culture of the country."
And one of the "cool" things the family has done is camped overnight in a zoo.
Brad told Britain's HELLO! magazine: "We do some really cool stuff too. When Angie was filming 'Unbroken' we spent a night at a zoo. It's great fun, you can rent tents and sleep out there overnight and see the animals all night long. We had a great time."

Mel B plays "dress up" in her old Spice Girls outfits with her friends.
The 39-year-old star has kept all her old clothes and while she and her pals like donning the costumes for fun, her eldest daughter Phoenix, 15, just "laughs".
She said: "I keep everything so on a Friday night when my friends come round we do dress-up.
"I've still got all the old costumes in storage. My eldest daughter Phoenix gets them all out and laughs her head off."
Mel - who also has daughter Angel, seven, with Eddie Murphy, and Madison, three, with husband Stephen Belafonte - also revealed she lets her spouse buy all her accessories because she thinks he has great taste.
She said: "Stephen has an eye for everything. He buys all my shoes and handbags."
The 'X Factor' judge has recently shown off a short, sleek bobbed hair style and says her new look has made her dress in a more feminine way.
She explained to Grazia magazine: "I think with shorter hair you have to be more conscious of what to wear because you don't want to look too boyish. You want to stay looking ladylike."

Vogue Williams takes a day to recover from a hangover.
The 29-year-old model-and-DJ loves going out partying with husband Brian McFadden but admits she suffers heavily for her alcohol consumption the following day.
She said: "I love going out. Brian and I are going to Las Vegas soon to see Britney Spears. But these days I need a full day to recover after and I have been known to eat three takeaways in one day on a hangover."
Vogue says Brian - who she wed two years ago - is the perfect husband and incredibly thoughtful.
She told Closer magazine: "Brian always gives great presents. He got me a make-up course this summer which was brilliant. And he makes me scrambled eggs on toast for breakfast most mornings."
And for her recent birthday, Brian treated Vogue to a romantic break to Paris - but she admitted they rowed over what to do.
She said: "I loved Paris. Brian and I did all the sights - though we ended up having a disagreement because we both wanted to do different things."