John Shearer/Getty ImagesAt last night's season six premiere party for Entourage, Hayden Panettiere was a law-abiding underage actress.
Despite the Belvedere vodka flowing freely at the fete, Hayden stuck to sipping water as she hung with Jeremy Piven and newcomer Alexis Dziena.
Adrian Grenier was spotted chasing another blond babe...
The actor worked the room with his vodka soda in hand as he flirted up a storm with a mystery blonde.
On-and offscreen couple Jamie-Lynn Sigler and Jerry Ferrara couldn't keep their hands off each other at the party, held at the Paramount Studios lot.
"They cuddled and made out all night," a source tells E! of the lovey-dovey twosome.
Also toasting the new season of the HBO hit show: Tobey Maguire, Kevin Connolly and Kevin Dillon.
We can't wait until season six premieres this Sunday night, but check out some sneak peeks in the meantime.
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