Kim Kardashian reveals why she doesn't smile in photos

Kim Kardashian has revealed the reason why she rarely smiles in pictures.

Being super rich, famous and beautiful, you'd think Kim, 34, would be constantly beaming. But there's a simple reason behind her sultry pouting.

The star posted a snap to Instagram this week, showing her flashing her dazzling teeth. She cautioned it: "See I do smile… even laugh on occasion. Not too often though because it causes wrinkles."

It seems she and husband Kanye West, 37, are a match made in gloomy heaven. Last year the rapper tweeted: "Not smiling makes me smile."

As with a lot of things Kanye says, we're not quite sure how that one works – but it makes sense to him.

Nicki Minaj on break-up: "I had to learn how to sleep alone"

Nicki Minaj has opened up about her painful break-up from her boyfriend of 11 years Safaree Samuels.

The 32-year-old rapper said her latest album The Pink Print is her most personal to date, and she wanted to give her fans an insight into her personal life.

She told Rolling Stone: "One of my goals was to give people a glimpse into my personal life, because it's something I've kept very private.

"I had to learn to do something as simple as sleep alone. I struggled with 'Do I express these feelings?' And I decided there's no reason for me to hide. I'm a vulnerable woman, and I'm proud of that."

During another interview with a US radio show, Nicki added: "This is somebody I grew up with. Like, I don't even know how I'm going to function without that in my life.

"I never lived my life as a famous person without him. I don't think people realise it's not just a break-up, that was a humungous part of my life."

Christina Aguilera in 'Disneyland meltdown'

Uh-oh. Former Mickey Mouse Club star Christina Aguilera reportedly got into a fight with the big man himself.

That's right. Christina, 34, allegedly picked a fight with Mickey while she was at Disneyland last month – because he wouldn't have a picture with her.

A source told TMZ Christina allegedly screamed 'Do you know who I am?' at Mickey, before calling him an 'a**hole'.

The singer later uploaded a snap of her trip to the park, writing: "Fun birthday celebration at the happiest place on earth #disneyland"

A source told US Weekly: "Christina is a frequent guest at Disneyland. She loves the park and they adore her."

Britney Spears' family Christmas with new boyfriend

Britney Spears spent Christmas this year with her new man Charlie Ebersol and her two sons – and shared some adorable photos from their celebrations.

The 33-year-old uploaded the first snap of sons Sean, eight, and Jayden, seven, from her marriage to Kevin Federline, looking very happy next to the Christmas tree, writing: "'Twas the night before Christmas!"

She then posted one of them all together, adding: "Wishing everyone a happy and healthy Christmas!"

Britney confirmed her new relationship in November and it looks like things are going very well for them!

Last year Britney split from David Lucado, after it was reported he cheated on her. In January 2013 she called off her engagement to Jason Trawick, after four years.

Let's hope Britney has found her happy every after!