Justin Timberlake dances with Olivia

Justin Timberlake spent a night "dancing" with Olivia Wilde on Saturday night (02.04.11).

The singer-and-actor and the 'Tron: Legacy' actress - who are currently shooting new thriller 'Now' together - were spotted at Los Angeles nightspot Roxbury, and according to onlookers were inseparable for most of the evening.

The two stars have both recently become single, with Justin announcing his split from Jessica Biel, his girlfriend of four years, in March, while Olivia filed for divorce from her husband of eight years Tao Ruspoli in the same month.

A source told UsMagazine.com: "They were obviously on a date. They were dancing, whispering, he had his hand on her back and shoulders and they were together all night."

Two stars were joined by DJ Samantha Ronson and several other friends in the VIP section of the club, but were allegedly only interested in speaking to each other.

Another source said: "His arm was around her, they were talking closely, just the two of them. Justin and Olivia were there with a group, but weren't talking to anyone else."

After enjoying a few hours gyrating to the music and drinking vodka, the duo - who were both were wearing white T-shirts and jeans - moved to the patio section of the Hollywood hotspot so Justin could listen to hip-hop before leaving together at 3.00am.