Washington, June 4 : Playboy playmate Holly Madison suffered a slight wardrobe malfunction while partying in Sin City on Saturday night.

Onlookers say that Madison was left a little red-faced at Niche Media's Vegas magazine soiree at PURE nightclub when the top of her dress popped open in front of a group of high-brow guests.

"She was embarrassed but was humbly laughing about the whole thing," Fox News quoted a source as saying.

Meanwhile, the former girlfriend of Hugh Hefner is all set join former Spice Girl member Mel B on the raunchy musical `Peepshow'.

Madison, 29, has been trying to launch a solo career ever since she broke up with Playboy founder Hefner.

`The Girls Next Door' star has been given a role in which she is required to bare her breasts.

She will be joining Mel B as a replacement for Kelly Monaco on the show. (ANI)