New mum Lily Allen covers up post-baby weight loss as she joins a load of half-naked underwear models for first gig in four years

New mum Lily Allen took to the stage last night for the first time in FOUR years.

New mum Lily Allen took to the stage with a load of half-naked models at Paris Fashion Week. Copyright [Rex]

The singer, who has taken time out in recent years to have babies, performed live at the ETAM show at Paris Fashion Week.

And while she covered up her post-baby weight-loss in a floaty patterned dress, she was joined by a load of ladies who had far less on.

Lily Allen hit the stage in a floaty patterned dress and heels. Copyright [Rex]

Mrs Cooper shared the stage with a bunch of half-naked underwear models, who strutted their stuff whilst Lily sang.

And the mum-of-two took a gander at the skinny bunch, as they strutted past her during her first gig in four years.

Lily Allen took a look at the half-naked underwear models as they strutted past. Copyright [Rex]

Earlier Lils took to Twitter to tease followers about her return to the stage, posting: "Just did rehearsal for tomorrow's ETAMShow with @iammarkronson, still know the words to Smile, which is good #mumback

And her two-month-old baby daughter Marnie was in the audience to cheer on her popstar mum, joined by daddy Sam Cooper.

Lily was also joined on stage at the swanky fashion show by British popstar Rita Ora, who sexed up the stage in a short, lace 60s-style dress with strappy gladiator heels.