| A wild night on the town for Girls Aloud is set to create more speculation about the state of Cheryl Cole's marriage after the singer stepped out without her wedding ring.Cole was out for the night to celebrate the birthday of bandmate Kimberley Walsh's sister Sally, minus the rock from husband Ashley Cole.Its absence appears to signify the Chelsea footballer is far from out of the doghouse over allegations earlier this year he had an affair with a hairdresser.Despite any relationship woes, Cheryl beamed as she partied with Kimberly and fellow Girls Aloud member Nicola Roberts at the bash.They all let their hair down at the birthday party in the exclusive Mayfair hangout, the Burlington Club.A fellow clubber said: 'All of the girls appeared intent on having a good time and Cheryl was no exception.'The evening provided a break for Cheryl, 25, who is just started her new job as judge on The X Factor.As replacement for Sharon Osborne, she and the rest of the panel are currently touring the country for the auditions stage of the programme.Her husband meanwhile is deep in training for the start of the premiership season, ensuring that the couple have little spare time to be together.Cheryl first shot to fame on Pop Stars: The Rivals, a precursor to The X Factor, when she was hand-picked for the girl band which became Girls Aloud.She and Cole married in a glittering ceremony two years ago.No ring: Cheryl leaving the birthday bash.Looking good: Cheryl and a friend leave the Burlington Club. Family affair: Kimberley Walsh with sisters Sally and Amy. Leggy: An immaculate-looking Nicola Roberts steps out to the party |