The couple co-starred in the film "Wanderlust."
Justin Theroux, left and Jennifer AnistonJennifer Aniston is engaged to actor-screenwriter Justin Theroux, People reported. The couple have been dating for more than a year.
"Justin Theroux had an amazing birthday on Friday, receiving an extraordinary gift when his girlfriend, Jennifer Aniston, accepted his proposal of marriage," his spokesman told People.
Aniston's representative,Stephen Huvane, confirmed the report to the Associated Press on Sunday night.
The couple co-starred in the film "Wanderlust."
It will be the first marriage for Theroux and the second for Aniston, In 2005, she split from her husband of five years, Brad Pitt.