Happy birthday to you, happy birthday to you, happy birthday, dear Tulisa Contostavlos...

X Factor London Tulisa Contostavlos

...HAPPY BIRTHDAY TO YOU! Today is new X Factor judge Tulisa's 23rd birthday and by the looks of things the partying youngster isn't going to be giving up her reputation as party girl any time soon. Despite heading off to Liverpool at 10AM this morning for the latest round of auditions, the N-Dubz star is already celebrating!

The singer spent the night partying with her X Factor pals including the show's host Dermot O'Leary at a posh hotel, but this was only the pre-party! With the final X Factor auditions today and tomorrow in Liverpool, Tulisa will have to wait until the weekend until she can let loose.

However with the Boootcamp stages of The X Factor 2011 se t to kick off before the end of the month, there won't be much time to another Ibiza getaway like the London star enjoyed last year.

A source said: "Tulisa’s having a big knees-up for her 23rd birthday at London’s Merah club on July 16, and all the X Factor judges, cast and crew will be in attendance. As will Cheryl [Cole]".

Tulisa said about Cheryl previously: "She’s been lovely.

“She’s always been someone I’ve admired because she came from the same background and, regardless of it being Newcastle, we’re two people who have come from nothing.

The X Factor 2011 auditions kick off at 10AM at Liverpool's Echo Arena today.

Tulisa Dermot Birthday
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