Cavallari, meanwhile, was sitting with her new businessman boyfriend and friends – and the new Hills star bounced back and forth, chatting with everyone except her castmates. And while Cavallari wasn't too affectionate with Smith, at one point she did put her arms around him.
The cast of Dancing with the Stars hung out at Coco de Ville after their last show, where Mya was throwing a party. Derek Hough sipped beers and seemed really into the music, though he didn't really bust a move. The dancing pro also perked up when a waitress brought over a bottle of champagne with sparklers in it. Hough was sitting with Cheryl Burke, newly single Maksim Chmerkovskiy and Mya's partner Dmitri Chaplin as they all enjoyed their evening away from the parquet.
Where's the entourage? A solo Adrian Grenier was spotted outside his Parisian hotel trying to rent one of the city's VelLib bicycles with a credit card. Afterward, he was driven over to the Palais de Tokyo for the Gareth Pugh fashion show, where he slid in alongside Rihanna.
Nicky Hilton hung out with four girlfriends at Tea Room, a lounge inside h.wood in L.A. The heiress was super casual, wearing her hair pulled back and a leather jacket. Also flying under the radar: Topher Grace, who spent a good amount of time at the bar playing air guitar to a soundtrack of Guns 'N Roses tunes.
By JENNIFER GARCIA and PETER MIKELBANK
Thursday's Caught in the Act >