In the seven years she’s been in Girls Aloud, it is fair to say Nicola Roberts has become more sartorially daring – and her 24th birthday party was the perfect place to show off her love of risque fashion.

Dressed in a partially sheer black dress, the pop star teamed her unusual choice of ensemble with gold sandals, shoulder-bag and a mystery ginger-haired man.

And while unknown gentleman appeared to be staying close to the singer, her fellow bandmates – bar one – were nowhere to be seen.

Ever the party girl, Sarah Harding attended the central London event at 50 St James and partied the night away before appearing to fall asleep in the cab on her way home.

And although hard-working Cheryl Cole was absent, presumably due to preparations for tonight’s X-Factor, it is unknown why Kimberly Walsh and Nadine Coyle did not make an appearance.

However, this did not seem to dampen the Liverpudlian’s spirits.

Wearing scarlet lipstick and her trademark amber, messy bob, the star looked happy at the end of the night clutching a flower which was presumably a gift from one of her attendees.

Smiling broadly , a weary-looking Roberts appeared to have had a birthday to remember. But who the mystery man on her arm was, remains to be revealed.

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