WHO WAS THE QUEEN OF HEARTS?

We're picking up a Valentine's theme from Kim Kardashian, left, and Heidi Montag, who were in Las Vegas Saturday to host Valentine's Day parties. Kardashian hosted The Queen of Hearts Ball at Lavo (Palazzo) and Montag and her husband Spencer Pratt co-hosted at Pure. (Photo of Kardashian courtesy Denise Truscello, WireImage; photo of Montag courtesy of Scott Harrison, Retna)