Foxes thinks new 'Doctor Who' actor Peter Capaldi is better looking than his predecessor Matt Smith.
The 25-year-old singer will make a cameo in the upcoming series of the science fiction favourite, and she has admitted she finds the new Time Lord more attractive than his former self.
After refusing to confirm whether they filmed any scenes together, she told Digital Spy: "I love him though.
"He's such a charmer. I was asked who I fancy between Matt and him and I was like, 'Peter Capaldi!'"
The 'Let Go For Tonight' hitmaker couldn't reveal whether her character would be a human or an alien, but she did insist she thought she was "nice".
She said: "I can't say! I'm not playing a villain. I think I'm nice in the show."
Talking about the song she has written for the show, Foxes admitted fans will hear her out of her "comfort zone" when she performs the track during the episode.
She added: "I've done a song for 'Doctor Who', and it's a little bit different from what I'd usually do. "It was really nice to be out of my comfort zone.
"I'm singing it on the episode ... It's one of those things where I wouldn't say no [to releasing it after it airs] but I don't really know yet."

Kourtney Kardashian wants to go on bed rest.
The 35-year-old beauty, who is expecting her third child with Scott Disick, is eager to take it easy in the latter stages of her pregnancy after working non-stop in recent months on her new children's fashion line with sisters Khloe and Kim, as well as filming a new 'Keeping Up with the Kardashians' spin-off in the Hamptons, New York.
She told Access Hollywood: "I'm gonna put myself on bed rest someday. I told my doctor, when I get home you just need to put me on bed rest so I can lay in bed and get massages and relax."
Despite being rushed off her feet, Kourtney - who already has son Mason, four, and two-year-old daughter Penelope with Scott - admits her time in the Hamptons has been enjoyable.
She added: "I do feel good ... and the Hamptons has actually been really relaxing, so I'm happy to be out there."
Meanwhile, sister Khloe, 30, thinks she and Kourtney have become "boring" since relocating to the popular vacation spot in comparison to their antics back home in California.
The star said: "We are so boring in the Hamptons. We are! It's bizarre."

Kanye West complained about "scratchy" toilet paper on a train ride.
The 36-year-old rapper was unimpressed with the amenities on offer as he took the Eurostar from Paris, France, to London, England, last week to perform three headline gigs at Wireless festival and had his staff gather up napkins for him to use in the bathroom instead.
A source told The Sun newspaper: "Kanye is very particular about his toilet paper. He couldn't believe that in a first class carriage, they had scratchy loo roll.
"He didn't make a fuss to Eurostar staff, but he was heard moaning to his inner circle. He didn't like the texture and requested a softer tissue.
"His staff gathered up the napkins to use as an alternative."
It seems the 'Blood on the Leaves' rapper endured a difficult trip from Paris to London as his Eurostar train was delayed by four hours following a technical fault.
The usually hotheaded A-lister appeared in good spirits despite the setback and happily posed for pictures with fellow travellers.
Once in London, the 'Stronger' hitmaker - who was booed by the Wireless crowd for a 20-minute rant onstage - reportedly had a meltdown backstage because of the colour of the linen in his dressing room.
A source previously claimed: "Kanye will only ever have a white dressing room, and this is usually included in his rider. But for some reason, there was black linen in his dressing room on the Finsbury Park site. This could not be allowed to happen. Organisers were told to get rid and replace it with the white stuff or Kanye wouldn't set a foot in there.
"Over the next few hours, festival staff were dispersed all over town to buy new crisp, white linen to replace it all. It was chaotic, but nobody wanted to upset Kanye. Especially as he'd stepped in to replace Drake at the last minute. There was pure panic for a while, but luckily, some were sourced just in time."

Zoe Saldana wants teenage boys to fancy her in 'Guardians of the Galaxy'.
The 'Colombiana' actress stars as alien beauty Gamora in the upcoming sci-fi-adventure and she's confessed one of her main worries during production was making herself look attractive in her costume and make-up.
Quizzed on whether her character's image had been decided before she joined the project, Saldana explained: "No, I think we had maybe seven or eight camera tests we had to do, when it came to all the characters and for mine specifically it was, 'How alien do we want Gamora to look like?' And what I was thinking was, 'She just needs to be pretty' ... For some reason because I was going to be green and I was going to be the lead girl, I just wanted teenage boys to find me attractive."
The 36-year-old star - who appears alongside Chris Pratt, Karen Gillan, Vin Diesel and Bradley Cooper in the movie, which sees adventurer Peter Quill (Pratt) as the object of a bounty hunt after stealing a mysterious orb - blames her age for her worries about getting the right look for Gamora.
She told ScreenRant: "Maybe because I'm older and you kind of go, 'Am I losing my sex appeal or something?' When you're green for four months, it definitely moves you a bit and you do kind of wobble going, 'Okay, what is beautiful?'
"And then you start to find your character really appealing and very beautiful in how different she looks and you get used to it."
'Guardians of the Galaxy' is scheduled for worldwide release on August 1.

Nicole Richie says being spanked by Britney Spears was the "greatest moment" of her life.
The 32-year-old star was brought on stage during a performance of Britney's Las Vegas residency in February and she was thrilled to be involved in the stage show because she is such a big fan.
Speaking to Jimmy Fallon on 'The Tonight Show', she said: "I finally went to go see her in concert. I'm grooving, I'm having the best time.
"All of a sudden, her big security guard just taps me on the shoulder. He says: 'Come with me'. He pulls me up on stage ... and her dancers come over to me and whisper 'Get on all fours' ... It's just something you don't question."
Nicole - who has children Harlow, six, and Sparrow, four, with husband Joel Madden - then had a harness strapped onto her and was walked like a dog by the 'Toxic' singer, who then pulled out a whip and spanked her.
The 'Simple Life' star admitted she was a massive fan of Britney growing up and regresses back to her teenage years whenever she hears her music.
Nicole said: "Britney Spears came out when I was 15. And this was the last time in my life that I was like a die-hard fan.
"That love never went away; when I see Britney Spears, I turn into my 15-year-old self."

Victoria Beckham attends exercise classes with her sons.
The former Spice Girls singer - who has children Brooklyn, 15, Romeo, 11, Cruz, nine, and Harper, two, with husband David - was delighted when the SoulCycle class she attended in Los Angeles with her spouse agreed to provide specialist equipment so the boys could join in the sessions.
She said: "They brought in some little mini bikes so Romeo and Cruz could do it too. It was the cutest thing."
These days, Victoria works out using celebrity trainer Tracy Anderson's programme five days a week after admiring the way she had transformed her friend Gwyneth Paltrow's figure, and though she claims to be "addicted" to the sessions, she admits they are difficult.
She said: "I had dinner, funnily enough, with Gwyneth Paltrow and Valentino and I said to Gwyneth, 'I've seen pictures of you recently and your body is amazing...'
"So I started when I was pregnant and got addicted. It's very challenging."
While Victoria doesn't regret putting her pop star days behind her, she misses dancing.
She told Britain's Vogue magazine: "I don't miss being on stage - though it was great at the time - but I do miss dancing.
"I was a dancer before I was in the Spice Girls."

Margot Robbie doesn't think she's attractive.
The 'Wolf of Wall Street' actress, who grew up in Dalby, Australia, never thought she was good looking when she was a youngster and believed her school friends were more beautiful than her.
Speaking to Vanity Fair magazine, she said: "In my big group of girlfriends at home I am definitely not the best looking. I did not grow up feeling like I was particularly attractive."
Meanwhile, the 24-year-old stunner - who shot to fame after starring as Donna Freedman on the soap opera 'Neighbours' in 2008 - insists she's tried to remain grounded throughout her time in the limelight and claims she still manages to live a normal life.
She explained: "I'm not extravagant. I share my house in London with five roommates. I take the Tube. I intend to stay the exact same person I always was."
Margot recently wrapped up filming for 'Z For Zachariah' in New Zealand, and is currently working on 'Tarzan', in which she plays Jane alongside 'True Blood's Alexander Skarsgard as the lead role.
The new 3D production is set to be released in 2016.

Zoe Saldana would never gain weight for a movie role.
The 36-year-old star wouldn't allow herself to be forced to go on an extreme diet for the sake of a film because she doesn't like to mess with her body's happy balance.
Speaking to Digital Spy, she said: "I don't like to f**k with my body like that. I think it's marvellous when actors do, but I know I don't have it in me to not eat, or to over-eat. I would rather shoot myself in the foot."
The 'Guardians of the Galaxy' actress has praised her co-star Chris Pratt for losing more than 60 lbs to play Star-Lord in the upcoming Marvel movie.
She added: "This is not invalidating what Chris has done, he had to go through the transformation and it was a spiritual thing as well for him, and he looks fantastic."
The brunette beauty also has admiration for actors who can change their bodies to suit a role and snap straight back into shape after the job has wrapped up.
She explained: "I really admire actors like Christian Bale and Jared Leto who go up and down, but they're gifted, and once they're done with that movie they go back and look like who they are.
"I don't think that would happen to me. I love Shake Shack [a fast food chain] too much, as well!"

Ellen DeGeneres and Portia de Rossi are reportedly trying to work through their marital issues.
The couple's relationship allegedly hit the rocks recently after an argument reportedly led to Portia seeking treatment in rehab for drug and alcohol problems, but the duo are keen to repair their romance and move on.
A source told PEOPLE.com: "They've had their ups and downs. Portia has been very outspoken about previous issues, like her eating disorder, and she's good at seeking help when she needs to.
"They've worked out difficulties in the past, and no doubt they're trying to work out any problems right now."
The couple enjoy renovating properties together and it is believed their argument stemmed from Portia feeling like she had taken on one of the projects alone.
The source explained: "At times Portia felt overwhelmed at all that goes into redoing a house and moving to another, no matter how lucrative it may be.
"She felt like she was doing everything herself and needed some downtime."
Meanwhile, friends of the pair believe they will have patched up their differences by next month and will celebrate six years of marriage by renewing their vows.
The source said: "They both love to celebrate special occasions and holidays, and their wedding anniversary is no different. They usually celebrate with a big party and invite a lot of friends. They really are a lovely couple. They enjoy being married, and it shows."

Jenny McCarthy has set a date for her wedding.
The former Playboy model, 41, has revealed she and her fiancé Donnie Wahlberg, who proposed to her in April, will by tying the knot "very soon" and she's now in a rush to find the perfect gown for her big day.
Speaking on 'The View' last night (08.07.14), she said: "I will say that. It's soon, it's very soon so if you guys have dress ideas please send them."
The blonde beauty is also trying to get in shape for when she walks down the aisle, but admits she's running out of time and is far from prepared for the romantic nuptials.
She hinted: "It's soon [enough] that I should be on a treadmill as we speak or at least getting a manicure. Can you see these [nails] I am just, like, not ready at all."
Meanwhile, Jenny has already decided that she won't be a busty bride when she gets hitched because she doesn't want her cleavage to draw too much attention.
She said previously: "I don't want to be too busty in my wedding dress. I think when brides are too busty it takes away from the beauty of the bride. It will be form fitting, but not too over done."
Jenny - who has a 12-year-old son Evan from her marriage to John Mallory Asher - has also ruled out wearing pink or white on her big day.
She added: "So that leaves us with a few more colours in the rainbow."

Khloé Kardashian was dreading turning 30.
The 'Keeping Up With the Kardashians' star, who celebrated her milestone on a private yacht in New York last month, admits she was worried about leaving her 20s behind but was curious about the next chapter of her life.
She told E! News: "I was really freaking out to turn 30. I think everyone does ... I was really freaking out and I would not accept it and I think I'm slowly like, you know, let's put the 20s behind me and there were some good years and some not so good years so let's hopefully have the 30s be all good years.
"Everyone says that the 30s you get this different sense of confidence and you lose all of your insecurities."
The brunette beauty admits it was her sister Kim, who has 12-month-old daughter North with husband Kanye West, who made her worry about growing older.
She explained: "[Kim] said the day you turn 30 you're going to find a wrinkle that you never thought you had!"
Kim asked: "And did you not find it?"
Khloé joked: "My face now is getting old because of you, because you give me the biggest complexes!"

Kourtney Kardashian and Scott Disick are reportedly seeking relationship counselling.
The long-term couple have had private meetings with Pastor Rich Wilkerson Jr., who officiated Kim Kardashian and Kanye West's wedding in Florence, Italy, in May, to help save their romance after it recently hit the rocks.
A source told TMZ.com: "Pastor Rich Wilkerson Jr. is actually counselling Kourtney and Scott over their relationship problems."
The pair - who have been together for eight years - have called on the pastor for advice after they had a number of arguments over Scott's alleged out-of-control partying.
The duo's relationship woes kicked off last month after Kourtney, 35 - who is expecting the couple's third child - reportedly threw Scott out of their rented property in the Hamptons, New York, following a furious row over his heavy drinking and wild antics.
Despite the regular disagreements, friends of the pair insist it won't mean the end for the couple - who have four-year-old son Mason and two-year-old daughter Penelope together - as they regularly get into arguments over the same topic.
A source said previously: "Same old s**t. They fight, get back together, he parties, she doesn't like it."