H'wood Party Girl

Let's pretend you're Paris Hilton and it's Saturday night.

Your boyfriend Benji Madden has a show to play at the Wiltern in L.A., but there's also a new club opening in Las Vegas you want to hit.

What's a socialite to do? If you're Paris, both.

After Good Charlotte's 8 p.m. show wrapped, the lovebirds jumped on a jet and headed to Sin City just in time to catch Gavin Rossdale's performance at Wasted Space, the new club at the Hard Rock Hotel.

Unfortunately for Gwen Stefani's hubby, the audience wasn't exactly attentive...

"He shushed the crowd between each song," says an eyewitness to his acoustic set, who adds that the frustarated rocker even made snide remarks about Vegas. Burn!

Toward the end of his set, one audience member yelled, "We want Dave!" (As in Navarro, who took the stage after Gavin with his band, Camp Freddy.)

"Dave who?" Gavin responded. "Shut up and let me finish my song!"

When Dave finally took the stage, he told the crowd to talk to each other and take as many trips to the bar as they wanted, because "it is a party, after all."

Leave it to Paris to take his advice to heart. At one point in the show, the heiress took out her compact and touched up her makeup in front of everyone at her table.

Guess she really didn't want to miss the show...either that, or she just can't stand not seeing her own reflection.