Paris, Benji, Nikki, And David In Vegas Festivities

For the second evening, Paris Hilton and Benji Madden took in the nightlife Vegas - this time in celebration of Allison Melnick's birthday on Saturday night (June 7).

Joining the former Simple Life star and his Good Charlotte rocker boyfriend Tao nightclub in Paris Hilton were "sister Nicky and her beau David Katzenberg - with the group mixture with a little alcohol, dancing and socializing.

As reported previously, Paris Hilton spent the evening before the filming of his new MTV reality show, Paris Hilton's My New BFF, the same popular Sin City nightspot.

During her Friday evening festivities, Paris was greeted with his song "Stars Are Blind" before continuing the dance, smoke cigarettes and drink vodka Grey Goose, breaking the rumors that she expected her first baby.