Jennifer Aniston engaged to Justin Theroux

Theroux proposed to 'Wanderlust' co-star Aniston while celebrating his 41st birthday on Friday

Jennifer Aniston is engaged to boyfriend Justin Theroux.

Actor/screenwriter Theroux proposed to Aniston, 43, while celebrating his 41st birthday on Friday (August 10). His representative told People: “Justin Theroux had an amazing birthday on Friday, receiving an extraordinary gift when his girlfriend, Jennifer Aniston, accepted his proposal of marriage.”

Aniston and Theroux starred together in comedy film Wanderlust, which was released in February (2012). In the film, Aniston plays one half of a married couple who try out life on a commune, while Theroux portrays the commune’s sexually persuasive leader – scroll down to watch the trailer. The couple are believed to have been dating since May 2011.

On Friday (August 10), it was announced that Theroux has been hired to rewrite and direct Swear To God, a new comedy film starring Will Ferrell and Steve Carell. This will mark Theroux’s debut as director, but he has previous screenwriting experience, having scripted Iron Man 2 and co-scripted Tropic Thunder and Rock Of Ages.

Theroux has never previously been married, but Aniston was wed to actor Brad Pitt for five years until October 2005. The actress is currently shooting We’re The Millers, a comedy movie co-starring The Hangover‘s Ed Helms, that is due for release next year (2013).