updated 04/09/2013 AT 4:30 PM ET
•originally published 04/09/2013 AT 7:30 PM ET
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.