Theroux popped the question on Friday, Aug. 10, his 42nd birthday.
“Justin Theroux had an amazing birthday on Friday, receiving an extraordinary gift when his girlfriend, Jennifer Aniston, accepted his proposal of marriage,” said his rep.
The couple, who met while filming “Wanderlust,” have been dating for more than a year.
Aniston, 43, was married to movie star Brad Pitt from 2000 to 2005; this will be Theroux’s first marriage.
Congratulations to the happy couple!