Sexy Stars: Kourtney Kardashian flashes her booty while sister Khloe goes nearly nude

Wowza! Celebrities got bold with styles this week that may be considered borderline wardrobe malfunctions.

Kourtney Kardashian flashed her perky bum at the Angel Ball in New York City in a black gown with some bizarre ruffle detailing. Her little sister, Khloe, showed off her jaw-dropping body in a nearly nude dress with appropriately placed sequined detailing.

Meanwhile, Christina Milian's ample cleavage spilled over a white dress, giving us Marilyn Monroe vibes.

Check out more sexy looks in the slideshow below: