"Justin Theroux had an amazing birthday on Friday, receiving an extraordinary gift when his girlfriend, Jennifer Aniston, accepted his proposal of marriage," his rep tells PEOPLE exclusively.
Aniston, 43, and Theroux, 41, an actor-screenwriter, have been dating for more than a year.
The couple – who both starred in Wanderlust – were first spotted together in May 2011.RELATED: What Jennifer Aniston Likes About Justin Theroux
"They are great friends," a source told WHO at the time.
During an interview on Good Morning America the next month, when asked about her personal life, Aniston couldn't hide her emotions.
"Yes, I'm very happy. I'm extremely lucky, and I'm extremely happy," she said.[[vid:mm:30244488|player=default]]