After countless breakup and engagement rumors since they began dating in May 2011, Justin Theroux's rep confirms that Justin and Jennifer Aniston are headed for the altar.

"Justin Theroux had an amazing birthday on Friday, receiving an extraordinary gift when his girlfriend, Jennifer Aniston, accepted his proposal of marriage."

Aniston has always said that she's "extremely lucky and extremely happy" when asked about her handsome boyfriend.

I love it! Jen has been through so much sh!t in the media since her split from Brad Pitt. We couldn't be happier for her and Justin!