Kim and Khloe Kardashian partied it up in Sin City over the weekend to celebrate younger brother Rob's 24th birthday.
The Kardashian crew — along with pals including Floyd Mayweather Jr. and Malika Haqq — ate dinner at Stack before heading over to JET nightclub at the Mirage.
Toward the end of the night, Khloe gave Rob a birthday shout-out on the mic, and then "the entire crowd joined together to sing 'Happy Birthday' as Rob was presented with a cake in the shape of an L.A. Lakers jersey," a spy at the club told us.
Noticeably absent from the festivities were older sis Kourtney and her beau, Scott Disick. The reformed party boy also skipped out on Kim's latest birthday bash in Vegas — afraid he'd be tempted by Sin City. During Kim's birthday weekend in Vegas two years ago, an out-of-control Disick started a fight with a waiter at Tao and ended up shoving money into the waiter's mouth.