Rumer Willis let it all hang out at ELLE’s 5th Annual Women in Music Concert Celebration at Avalon Hollywood on Tuesday. Demi Moore and Bruce Willis' daughter wore a black crop top and a skirt with side cut outs so large that her pink panties were visible.

At least she was wearing underwear - otherwise, it could have been a horrible wardrobe malfunction. But why didn't she go with black panties to blend in better?

A lot is going on with Rumer's family these days. Her father is preparing for the birth of his second child with model wife Emma Heming-Willis. Bruce and Emma have a 23-month-old daughter named Mable. Bruce has three daughters, Rumer, 25, Scout, 22, and Tallulah, 20, with ex-wife Demi Moore.

Meanwhile, Demi's ex-husband Ashton Kutcher is expecting a daughter with girlfriend Mila Kunis.