Cheryl Cole Celebrates Birthday In Las Vegas With Nicola Roberts And Kimberley Walsh (PICS)

What Happens In Vegas...

Despite having a number one single telling people to call her name, it appears Cheryl Cole has forgotten what it is herself.

The star has been feeling the effects of a messy night out in Las Vegas to celebrate her 29th birthday.

As she nursed her sore head the next day, she tweeted: "Erm… few questions!! Who am I? Where am I?? Why am I?? What am I?"

Open Image Modal

'Who am I?' Cheryl downs shots with Girls Aloud bandmates Kimberley and Nicola

Cheryl was hitting it hard with her Girls Aloud bandmates Nicola Roberts and Kimberley Walsh along with manager will.i.am.

Open Image Modal

'Will.i.am helps Cheryl celebrate her 29th birthday

On Saturday night, the clan headed to XS nightclub to see Will DJing, where she downed shots with Nic and Kimbers (we won't ask the awkward question about where Sarah and Nadine were...)

Earlier that day, her pals had arranged a slap up lunch for her, where they all donned masks of Cheryl's mug.

Open Image Modal

As Cheryl wrapped up the weekend's celebrations last night, she tweeted: "#DearVegas you win !! I officially bow down .. It wasn't a knock out i just took a graceful seat ! I came I saw YOU conquered #isaluteyou..

"#Vegas #3daysnosleeps #1body2minds #gohardorgohome#wheresmybed"

Open Image Modal

Cheryl pictured at her birthday lunch on Saturday

> IN PICS: CHERYL'S STYLE EVOLUTION

Style Evolution: Cheryl Cole
Style Evolution: Cheryl Cole(01 of21)
Open Image Modal
2003. Awww. The gorgeous glamazon we know and love had already started to blossom as a young popstar of just 21. (credit:Getty)
Style Evolution: Cheryl Cole(02 of21)
Open Image Modal
2006. Cheryl opted for a bit of WAG power at the Alien Autopsy premiere with a golden tan and some blonde highlights. (credit:Getty)
Style Evolution: Cheryl Cole(03 of21)
Open Image Modal
2007. People really sat up and took notice when Ms Cole stepped out at the Samsung Power of Purple launch in a curve-clinging bandage dress that showed off her amazing figure. (credit:Getty)
Style Evolution: Cheryl Cole(04 of21)
Open Image Modal
2007. At the 2007 British Red Cross Ball, Cheryl worked the wow-factor in a glittering gold Roberto Cavalli floor-sweeper. (credit:Getty)
Style Evolution: Cheryl Cole(05 of21)
Open Image Modal
2007. A black bra underneath a sheer nude top? We're not sure about Cheryl's fashion choice at the Julien Macdonald spring/summer 2008 show, but we do love the stylish blunt-cut fringe. (credit:Getty)
Style Evolution: Cheryl Cole(06 of21)
Open Image Modal
2008. For the 2008 National Television Awards, Cheryl channelled dip-dye fashion in a one-shouldered Matthew Williamson gown with gold-leaf detailing. (credit:Getty)
Style Evolution: Cheryl Cole(07 of21)
Open Image Modal
2009. Sixties siren! Cheryl was on fabulous form at the 2009 Brit Awards in a stunning A-line minidress by George Chakras, which featured cute floral appliqué. A slick of popping red lipstick finished the look perfectly. (credit:Getty)
Style Evolution: Cheryl Cole(08 of21)
Open Image Modal
2009. Cheryl blew the crowds away at the 2009 Pride of Britain Awards in an asymmetric mini, teamed with silver Louboutins and an Igor Chapurin clutch. (credit:Getty)
Style Evolution: Cheryl Cole(09 of21)
Open Image Modal
2010. Cheryl Cole attends the launch party for Promise, a new capsule ring collection created by Cheryl Cole and de Grisogono. (credit:Getty Images)
Style Evolution: Cheryl Cole(10 of21)
Open Image Modal
2010. Singer Cheryl Cole attends the de Grisogono party. (credit:Getty Images)
Style Evolution: Cheryl Cole(11 of21)
Open Image Modal
2010. Cheryl Cole performs at the de Grisogono Party. (credit:Getty Images)
Style Evolution: Cheryl Cole(12 of21)
Open Image Modal
2010. When you're making your first official appearance at the Cannes Film Festival, you've got to make it a show-stopper - and Cheryl did just that in a striking white Versace dress with a daring split, and stunning lace Louboutins. (credit:PA)
Style Evolution: Cheryl Cole(13 of21)
Open Image Modal
2010. Cheryl made waves at the 2010 Glamour Woman of the Year Awards in a Julien Macdonald 'mullet' dress - which looks better than it sounds! (credit:Getty)
Style Evolution: Cheryl Cole(14 of21)
Open Image Modal
2011. Cheryl attended the premiere of Habernus Papam at the Cannes Film Festival in a plunging white Stephane Rolland gown. (credit:PA)
Style Evolution: Cheryl Cole(15 of21)
Open Image Modal
2011. Cheryl Cole wears a gown from Victoria Beckham's Spring/Summer 2011 collection to the Pride of Britain Awards. (credit:PA)
Style Evolution: Cheryl Cole(16 of21)
Open Image Modal
2011. Her first outfit at her first set of US X Factor auditions was a tangerine, turquoise and purple combo teamed with a hair style paying homage to Jennifer Lopez's Oscar style circa 2002. (credit:PA)
Style Evolution: Cheryl Cole(17 of21)
Open Image Modal
2011. British singer Cheryl Cole arrives at the O2 arena in east London ahead of the Brit Awards. (credit:Getty Images)
Style Evolution: Cheryl Cole(18 of21)
Open Image Modal
2011. Cheryl Cole and Prince Charles, Prince of Wales at Clarence House. (credit:Getty Images)
Style Evolution: Cheryl Cole(19 of21)
Open Image Modal
2012. British singer Cheryl Cole arrives for the screening of Amour at the 65th Cannes film festival. (credit:Getty Images)
Style Evolution: Cheryl Cole(20 of21)
Open Image Modal
2012. Cheryl Cole attends the UK film premiere of What To Expect When You're Expecting in London. (credit:Getty Images )
Style Evolution: Cheryl Cole(21 of21)
Open Image Modal
2012. Prince Charles, Prince of Wales meets Cheryl Cole at the Prince's Trust's Invest in Futures gala dinner held at The Savoy.