Jennifer Aniston and Justin Theroux have become engaged, the actors' representatives have said.
Screenwriter and actor Theroux - whose screenwriting credits include Tropic Thunder, Iron Man 2 and Rock Of Ages - popped the question on Friday, which was also his 41st birthday.
"Justin Theroux had an amazing birthday on Friday, receiving an extraordinary gift when his girlfriend, Jennifer Aniston, accepted his proposal of marriage," Theroux's rep told People magazine.
The two have known each other for years, but started dating a year ago after working on the comedy Wanderlust.
The two moved in together and tabloids soon began predicting everything from marriage to babies for the new couple.
It will be 43-year-old Aniston's second marriage and Theroux's first.
Her union with Brad Pitt lasted for five years until their subsequent divorce in 2005.
While Pitt moved on to a long-term relationship with Angelina Jolie, Aniston had high-profile relationships with John Mayer and Vince Vaughn.
Aniston's engagement comes four months after Pitt and Jolie announced their intentions to tie the knot.
It is not clear if a wedding date for the couple has been set.