Holly Madison was busy doing her thing in Las Vegas, at Pure Nightclub partying the night away when something very unexpected happened to the former playboy bunny.

An eyewitness reports that Miss Madison was left with a face of a tomato when the top of her dress popped open in front of a group of jaw dropping open mouth guests that filled the room.

“She was embarrassed but was humbly laughing about the whole thing,” says another close source, on the scene. Although Madison should take this all in good strive and think of it as an unplanned rehearsal for her upcoming Vegas show, called Peepshow.