The True Blood couple is engaged to be married, Moyer's rep confirmed to TVGuide.com. No details on a wedding date or how the proposal happened were available.
Paquin, 27, plays the telepathic waitress Sookie Stackhouse who is head-over-heels for her bloodsucking boyfriend, Bill Compton (played by Moyer).
The couple announced in February that they have been dating since the beginning of the HBO series.
Moyer, 39, has two kids from a previous relationship — son Billy, who was born in 2000, and daughter Lilac, born in 2002.