Rob Kardashian celebrates His 24th Birthday At Jet nightclub At The Mirage Hotel And Casino [Getty Images]

Khloe Kardashian, Rob Kardashian and Kim Kardashian pose at Jet at The Mirage Hotel and Casino on March 18, 2011 in Las Vegas, Nevada. — see more

Khloe Kardashian, Rob Kardashian and Kim Kardashian pose at Jet at The Mirage Hotel and Casino on March 18, 2011 in Las Vegas, Nevada.

WireImage Jacob Andrzejczak