Kristin Cavallari's 24th Birthday At The Bank

Making for quite the fun-filled belated bash, Kristin Cavallari hosted a birthday fete at Bellagio Resort and Casino in Las Vegas on Saturday night (January 15).

Looking oh-so-sexy, the former "Hills" hottie (who turned 24 of Jan. 5) worked the arrivals area at The Bank nightclub venue before heading inside to be doted with a birthday cake in between drinks and dancing.

Credit: Celebrity Gossip

Holly Montag: Birthday at The Bank

She’s no stranger to a swanky evening out, and Saturday night (October 10) Holly Montag celebrated her birthday Sin City style.

The Hills babe was joined by her bff Stacie Hall as she descended on The Bank Nightclub, located at the Bellagio Hotel and Casino in Las Vegas.

And Holly was dressed to impress as she prepared to party, sporting a sexy black dress teamed with a pair of strappy black heels.

Coming up tomorrow night (Tuesday, October 13) be sure to catch Holly and the rest of the gang on a brand new episode of The Hills at 10pm EST on MTV.

Credit: Celebrity Gossip