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30 November 2011, 14:32 | Updated: 30 November 2011, 15:02
The X Factor judge and one half of the 'Take A Chance On Me' boy band partied out in London yesterday.
Tulisa Constostavlos and JLS stepped out in London last night (29th November) to celebrate Chipmunk's birthday.
The 'Take Off' rapper turned 21 on Saturday (26th November) and chose to party yesterday with his industry friends at Jalouse nightclub.
The X Factor judge was pictured in a white dress and black heels outside the event, while both Aston Merrygold and JB Gill from JLs were also in attendance.
'Take A Chance On Me' singer JB arrived with his girlfriend Chloe and both of them were clad in matching tuxedos.
"Praise God…The best birthday I have EVER had!!!" Chipmunk tweeted at the end of the night. "I don't even know what to say. Best night of my life. Need to take that all in man."
Tulisa's last remaining The X Factor act Little Mix have recently become favourites to win the current series of the ITV1 show.
The N-Dubz front woman recently denied claims she will perform on The X Factor ahead of her debut album's launch in 2012.