Although the blond beauty, who turned 31 Friday, has previously attended his movie premieres in Toronto and Los Angeles before, they always hit the carpet separately...until last night in NYC, when they were totally together for his latest, The Descendants.
And Stacy totally stole the show in her sexy dress!
The leggy looker rocked a gown with a thigh high slit and revealing sheer cutouts, ensuring George wouldn't be the only person onlookers were ogling.
After making their first official appearance together, the happy couple, who just returned from a getaway to Cabo San Lucas, continued their night on the town. George hit the official after party at the Stone Rose Lounge solo but reunited with Stacy later for dinner.
"He rushed out to meet her with a huge smile on his face when she finally arrived," a source says.
They were also spotted at Rose Bar inside the Gramercy Park Hotel, according to a source.