Jennifer Aniston, Justin Theroux Engaged!

Jennifer Aniston and Justin Theroux smile at American Cinematheque's 2011 Award Show Honoring Robert Downey Jr. at The Beverly Hilton Hotel in Beverly Hills on October 14, 2011 Jennifer Aniston and Justin Theroux smile at American Cinematheque's 2011 Award Show Honoring Robert Downey Jr. at The Beverly Hilton Hotel in Beverly Hills on October 14, 2011

Jennifer Aniston is headed down the aisle!

Jennifer and boyfriend Justin Theroux are engaged, a rep for the actress confirmed to Access Hollywood on Sunday evening.

As it turns out, Justin popped the question on his birthday.

“Justin Theroux had an amazing birthday on Friday, receiving an extraordinary gift when his girlfriend, Jennifer Aniston, accepted his proposal of marriage,” a rep for Justin told Access Hollywood.

Jennifer, 43, and Justin, 41 — who went public with their relationship last summer — met while filming the big screen comedy “Wanderlust.”

The star couple first stepped out together in June 2011 at a post-MTV Movie Awards bash at SoHo House in West Hollywood, Calif.

Soon thereafter, Jen brought Justin along to her taping of “Inside the Actors Studio,” where her new beau sat beaming in the front row during her interview with James Lipton.

This will mark the second marriage for Jen, who was previously married to Brad Pitt from 2000 – 2005.

Justin has never been married.

-- Eric Anderson

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