Lily Allen -- is anyone calling her Lily Rose Cooper? -- returned to performing and in an unusual 'fashion,' literally. The singer, who had retired from music and just birthed her second daughter, Marnie, hit the stage at a raunchy lingerie fashion show in Paris (Feb. 26).

Other performers at the Etam show were Rita Ora, dressed in red lace and sexy strappy boots that rivaled what the models were wearing in terms of hotness. M.I.A. was also on hand and performing.

Allen wore a vintage maxi dress that hit mid-calf and black heels. It was brown and white, but it wasn’t flattering. It was loose and just hung there. The color scheme was also somewhat drab.

Marc Piasecki, Getty Images

Perhaps she is still dropping the baby weight and was more interested in comfort. Allen has a quirky style, so she can wear whatever she wants as long as she lets her confidence take center stage, which she did at the lingerie show. We love her heavy bangs. They frame her face beautifully.

Marc Piasecki, Getty Images

Ora, who tends to favor red lace, rocked a mini and some "means business" strappy, dominatrix-style, Jimmy Choo boots. She wore her platinum locks in French braids, perhaps a nod to where she was?

Marc Piasecki, Getty Images

Check her checking out a model and her bootay.

Marc Piasecki, Getty Images

M.I.A. was dressed in gold tones and her signature street chic wear. She went heavy on the lame.

Marc Piasecki, Getty Images

Watch the Etam Lingerie Fashion Show