Rumer Willis bares her butt at a karaoke evening

Los Angeles - Rumer Willis was left red-faced after she ripped her leather pants during a karaoke session.

The 26-year-old actress was celebrating the birthday of her friend, Twenty Good Years actor Jake Sandvig, on Monday night when she suffered the unfortunate wardrobe malfunction.

However, Rumer wasn't too embarrassed about the butt-baring rip as she took to her Instagram account to share a snap of the tear.

The accompanying caption read: "When your brand new leather pants rip while you friend is singing karaoke on there bday. Thank you @jake.sandvig for bringing me a bad omen (sic)"



On her own birthday in August, Rumer was presented with a gun-shaped cake by her mother Demi Moore to celebrate turning 26.

The 90210 star - whose dad is Hollywood action hero Bruce Willis - posted a pic on Instagram, at the time captioned: "Best birthday cake ever. Thank you mama for making this day do (so) special. (sic)"



The cake was believed to be a reference to Rumer's appearance in For the Record, the stage musical tribute to movie director Quentin Tarantino, in which she performed the Nancy Sinatra song Bang, Bang (My Baby Shot Me Down).