JAnistonJTheroux230.jpg It's the engagement heard 'round the world, and now we have more details on Justin Theroux's proposal to Jennifer Aniston!

On a break from filming her upcoming film We Are The Millers, the 43-year-old actress flew to New York to spend the weekend with her 41-year-old screenwriter beau for his birthday, and little did she know she would be receiving the best present of all - a huge diamond engagement ring!

"It's a huge emerald-cut diamond. It's a rectangle with tapered diamond baguettes on the sides. It's beautiful," a source told Life & Style magazine about the bauble.

On Friday night, the couple dined at Blue Hill restaurant in the Big Apple's Greenwich Village, and it was there that the Wanderlust actor decided to pop the question to his love of eighteen months.

"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 the actor said in a statement confirming the news.

Following the engagement weekend, it was back to work for Aniston, who is currently on location in North Carolina.

Give us a peek of your sparkler already, Miss Aniston!