Over the weekend Paris Hilton and her sister Nicky partied it up at the Marquee nightclub in Las Vegas to celebrate pal Allison Melnick’s birthday, and it looks like the ladies had a blast!

Paris Hilton and Nicky Hilton party Las Vegas Allison MelnickRelated Article: Style We Want To Steal: Paris Hilton's Herve Leger Dress!

The Hiltons surprised their BFF with a custom pink cake, and Paris tweeted, "Love you @AllisonMelnick! What an amazing birthday weekend! You looked beautiful! Obsessed with your birthday dress!"  Of course, she also had some love for her younger sibling, writing, "Love my hot sister @NickyHilton! Best friend a girl could ask for!"  Aww!

It may have been her pal's big night, but Paris stole the spotlight when she began dancing on top of their table with a glow stick in her hand, singing along to the sounds of DJ Kaskade.  Ah, some things never change!

Paris Hilton Marquee Club Las VegasRelated Article: Paris Hilton Sparkles on 'Jimmy Kimmel Live'

Lookin' good, P!

Photo courtesy of Al Powers