Seth MacFarlane and Alexis Knapp
08/16/2013 at 09:00 AM EDT
creator Seth MacFarlane looks like he has a new lady in his life, and it's not cartoon wife Lois Griffin.
MacFarlane, 39, has been dating Pitch Perfect
actress Alexis Knapp, E! News reports
. Knapp's voice – coincidentally – could be heard on the "Valentine's Day in Quahog" episode of MacFarlane's hit FOX show this past season.
"They've known each other and have been friends for years," a source tells PEOPLE. "She's very bright and loves science like him. She's down-to-earth and sweet."
Before her breakout role in last year's Pitch Perfect
(as Stacie, a highly sexual member of the all-female a cappella group the Bellas), Knapp, 24, was featured in Couple's Retreat
, Percy Jackson & the Olympians: Lightning Thief
and Project X
. She will appear in the pilot of Rebel Wilson's new ABC sitcom, Super Fun Night"
, this fall.
Knapp might best be known, however, as the ex-girlfriend of Ryan Phillippe
, with whom she has a 2-year-old daughter, Kailani
Last year's Oscar host
most recently dated Game of Thrones
star Emilia Clarke
, but that reportedly ended in March.
Reporting by DAHVI SHIRA