Tears of joy!

To ask for Jennifer Aniston's hand in marriage, Justin Theroux chose a very special day (Friday Aug. 10, his 41st birthday) and a very special place: NYC, where the free-spirited couple have spent countless hours together.

After the actor and screenwriter presented her with the ring, "Jen cried," a confidante tells the new Us Weekly, out now, adding that Theroux's proposal was "simple."

To celebrate the engagement, the freshly engaged pair headed to Blue Hill, an acclaimed Greenwich Village eatery just steps away from Theroux's downtown NYC apartment, where he and Aniston, 43, have dined before.

It's the happiest ending imaginable for the Wanderlust costars, who have been dating for a year and a half.

A rep for Aniston confirmed the joyous news to Us late Sunday; Theroux's rep added in a statement, "Justin Theroux had an amazing birthday Friday, receiving an extraordinary gift when his girlfriend, Jennifer Aniston, accepted his proposal of marriage."

For all of the details on the proposal, the ring, their wedding plans and much more, pick up the new issue of Us Weekly, on stands Friday!