Justin & Jessica Christen Kress with PDA

Justin Timberlake and girlfriend Jessica Biel made a rare public outing, complete with public displays of affection Friday night in Hollywood at the official opening of Kress, which was crawling with celebs (see below).

Timberlake and Biel arrived around 11:30 p.m. at the four-floor club on Hollywood Boulevard, where a reserved cabana on the roof deck awaited them. They entertained a handful of friends with cocktails and entertained each other by making out repeatedly on the edge of their cabana booth, coming up for air occasionally to dance and laugh with one another.

Biel dressed casually in a white peasant blouse with braided sleeves, jeans and a Mulberry bag. Justin wore a short-sleeved henley and a plaid vest with jeans and a silver chain.

"They're very happy, and very much together," an onlooker told E! We're sure that was evident to Chris Evans, Biel's ex-boyfriend (they dated from 2001 to 2005). The Fantastic Four's Johnny Storm circled the roof all night, avoiding his ex.

"They didn’t interact. Chris just wandered around by himself, looking for a table to sit at," the source adds.

Perhaps he should've buddied up with yet another celeb linked to Biel, Maroon 5 frontman Adam Levine. Levine and a male pal made rounds (and wasn't spotted visiting with either Jessica or Justin), but the crowd or something must have rubbed him the wrong way. Adam pushed out of the venue in a huff around 1 a.m., raising his voice to security to let him through the waiting throngs.

Around 1:40 a.m., Timberlake and Biel were sneaked out a side roof entrance, and traipsed four flights down to the valet—holding hands the entire way. How sweet!

Back on the roof, Nick Lachey and Vanessa Minnillo holed up in their cabana looking smitten way past last call. Vanessa sipped Grey Goose while Nick opted for his standard Bud Light, both settling in a corner talking while guests filed out of the joint.

Also on hand: Lauren Conrad, Lo Bosworth and Audrina Patridge. The Hills ladies partied after a decidedly casual dinner at West Hollywood's Belmont Lounge, denying rumors that one of them has vacated their shared Hollywood Hills home. Still, they didn't seem in any rush to get back there, as they lingered well into the Hollywood night.

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