Claire, who starred in the last series of Celebrity Big Brother in January, smiled as she left 45 Park Lane Hotel and headed to a waiting car.
The blonde singer, who has two children with her hubby Reece, had spent the day at the exclusive venue unveiling her new line with Fashion World.
The star has been a brand ambassador since the beginning of the year, but this is the first time she has designed her own pieces.
Claire teamed her LBD with a black quilted shoulder bag and a pair of peep-toe shoes. We're loving the funky stud design on the back of the heels!
Speaking about her range, Claire has said: "I'm really excited about my first collection for Fashion World.
"When designing the range I've tried to create pieces that address all the areas where people might feel a little bit uncomfortable."
You go, girl!