Thanks for all your support! Tulisa toasts her close knit crew as she takes them for drinks to celebrate her PA's birthday

By Georgina Littlejohn

Last updated at 9:38 AM on 22nd December 2011

She's spent the past three weeks revelling in Little Mix's X Factor win and raising several glasses to the success of the group she mentored throughout the competition.

And with the Christmas season upon us, Tulisa Contostavlos shows no sign of having any cosy nights in just yet as she was snapped out on the town again last night.

But this time, it had nothing to do with her 'little muffins' or the festive season, but gave her a chance to hang out, catch up and toast her close friends as they celebrated her PA's birthday.

Party girl: Tulisa Contostavlos smiled for the camera as she joined her friends for a birthday party in London last night

Tulisa, 23, was joined by her crew for a bash held at the Mahiki nightclub in London for Gareth Varey's birthday and by all accounts, much fun was had by all.

Tulisa and Gareth were joined by DJ Ironik - real name James Christian Charters - stylists Abuk Joseph and Mekel Bailey and choreographer Levi Hibbert, as they let their hair down and toasted his birthday.

They all looked like they were having a good time as they crowded round a bucket of drinks for photographs.

Me and my boy: Tulisa poses with Gareth Varey, her personal assistant, who was celebrating his birthday

Tulisa looked very pretty in her strapless monochrome dress with an unusual neckline, her long dark locks loose around her shoulders.

Tulisa and Gareth were seen leaving the club in the small hours looking a little worse for wear as they bundled into a waiting cab.

No wonder really, if her Tweet at the start of proceedings was a hint at what the night would bring.

All the gang: Tulisa and Gareth pose with their friends including DJ Ironik (L)

Smile! Tulisa was loving the flashbulbs last night as she posed with two friends, one of them being stylist Abuk Joseph (R)

She wrote: 'Just poured the first drink of the night for @GarethVarey 's birthday,its 10pm, we got about 5 hours to go.....this could get messy.'

A few hours later, the birthday boy himself took to her Twitter page to thank everyone, including Tulisa, for coming along and helping him celebrate, and wrote: 'THE most amazing night!!! Love my friends!!!!'

Apart from all the parties and her amazing X Factor win with Little Mix, the first group to ever win the competition, Tulisa has yet another reason to celebrate this week.

According to reports, the N-Dubz star is set to pen her autobiography, even though she is only 23.

Home time: Gareth leads Tulisa out of the club as they head for their car

According to The Mirror, she will start writing the book in January and hopes to release it to coincide with the start of the next series of the X Factor.

The story claims three publishers are fighting to sign the singer, who could make £1.2million.

In the book, Tulisa could go into detail about her feud with fellow judge Kelly Rowland and her working relationship with the likes of Simon Cowell, Cheryl Cole and Louis Walsh.

Show me the way: Tulisa's hair covers her face as she holds onto her friend as she heads onto the street

She will also talk about her childhood, her rise to fame with N-Dubz and will include never-before-seen photographs.

A source told the newspaper: 'Tulisa may only be 23 but she’s had an amazingly eventful life. She has an incredible story to tell – some of which has never been written about – and it’s a unique opportunity to set the record straight.'

'Tulisa’s famed for being open and up front, saying it as she sees it. There will be no skeletons left in her closet. Dannii Minogue’s autobiography was a number-one best-seller whilst Cheryl’s two last year were also top-five smashes.'

Can we go now please? Tulisa looked as though she was urging the driver to take her home as she sat in the back of the car and giggled with her friends