XFactor winner Alexandra Burke partied like a superstar as she marked her 21st birthday last night.

After an early start promoting her new single Bad Boys, Alexandra hit the town shopping before ending the night partying with family and friends.

The Hallelujah singer feasted on Japanese cuisine at the upmarket Nobu Berkeley in Mayfair, before moving on to private members’ club Shoreditch House just before midnight to party until 4am.

Alexandra started her night off in a pair of PVC leggings and black satin smock, before changing into a more feminine black mini-dress for the the party.

The singer completing her outfit with a £1,500 black quilted Chanel handbag – apparently a birthday gift from Simon Cowell – and a £375 pair of burgundy patent Christian Louboutin Décolleté 100 Jazz pumps, which she had bought herself with birthday money.

The party was mostly an affair for friends and family, but X Factor runners-up JLS and TV presenter Myleene Klass represented the celebrity contingent.

Ten Years Younger host Myleene, 30, was bang on trend in a blue jumpsuit and black platform heels, which appeared a bit too tall for the star as she tottered into the club.

Arriving at Shoreditch House after her dinner, an excited Alexandra wrote on her Twitter micro-blogging page: ‘At my party. Just arriving. Need to drink much much more.’

Alexandra racked up a £10,000 bar bill at Shoreditch House, where she also enjoyed a game of bowling in the two-lane alley.

Notably absent was Alexandra’s mentor Cheryl Cole or any of the X Factor judges, who had compensated for their no show with a selection of pricey presents.

Simon Cowell bought her the Chanel handbag, while Dannii Minogue opted for a grey bag by Tabitha.

But her mentor Cheryl – who is currently filming X Factor in Morocco – opted for the biggest present of all – a £5,000 luxury holiday to the Constance Lemuria resort in the Seychelles, where the Girls Aloud singer honeymooned with husband Ashley Cole in 2006.

Also absent was Alexandra’s X Factor pal Ruth Lorenzo, who is currently writing her album in new native Spain.

With birthday money received by friends and family, Alexandra treated herself to a Louis Vuitton bag, a Tiffany ring and Stella McCartney clothing.

While Alexandra is yet to start making money from record sales, she is clearly growing a taste for the more expensive things in life since winning a £1million record contract last December.

In contrast to a year ago when she was living in a cramped house in Islington and sharing a double bed with her sister, Alexandra’s life has transformed beyond all recognition.

Alexandra started her big day off bright and early with a 7.30am visit to Chris Moyles’ BBC Radio 1 breakfast show, where she played her new single Bad Boys for the first time.

After doing several interview, Alex was finished work for the day and unwound with a massage at Bliss Spa in South Kensington.

Writing on her Twitter page, the enthusiastic star said: ‘Oh God… I’m actually 21… Kinda just hit me.’ >D.Mail