Justin Long had confirmed last December that he was in a relationship, however he has now confirmed that his partner is Kate Bosworth.
Bosworth had announced last August that she and her husband Michael Polish were separating, following 8 years of marriage.
Taking to Instagram, Dodgeball and Going the Distance actor Long posted a photo of the pair sharing a pint of Guinness, along with a green heart and emojis of the Irish flag.
Bosworth commented, "I'm the luckiest".
Last year, Bosworth paid a special tribute to Long, having met him on a film set last year.