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Scott Porter is engaged!

The Hart of Dixie actor and his girlfriend Kelsey Mayfield, who he's been dating for four years, are all smiles about spending the rest of their lives together.

"It happened late January," a source tells Us Weekly of their engagement. "It was during a trip to NYC. They're living together in Los Angeles."

Mayfield, who is currently a casting director on ABC's The Revolution, met Porter on the set of Friday Night Lights, where the actor played the role of Jason Street.

The source recounts to Us the beginnings of their relationship: "Kelsey thought Scott was a stunt guy on Friday Night Lights because she cheered at The University of Texas and bunch of former UT football players and mutual friends were the stunt team. It wasn't till a month later she discovered he was an actor on the show!"