Seth MacFarlane and Charlize Theron
SPW/Splash News Online
04/09/2013 at 04:30 PM EDT
There's no doubt that Charlize Theron
and Seth MacFarlane are friendly – but more than friends? Not so much – yet.
They've had the web buzzing with dating reports, following a dinner Monday night at Beverly Hills sushi restaurant Matsuhisa, a little more than a month after they chatted at length
at MacFarlane's post-Oscar bash in February.
But a source insists that while Theron, 37, and MacFarlane, 39, certainly get along, the basis of their relationship is work-related, as the two both star in A Million Ways to Die in the West
, which the Family Guy
creator also wrote and will direct.
"He's single," the source tells PEOPLE. "They're just friends. They start production on their film soon and this was a business dinner. They do get along great though and they have good friend chemistry."
Theron previously was in a relationship with Stuart Townsend. They split in 2010
after nine years together.