While its official opening is scheduled for tomorrow, the new Theater District outpost of Shake Shack had a "soft" opening yesterday (there was a soft opening for the UWS location in 2008). The Shack burger-lovin' Tweeted, "Still not that long of a line at Shake Shack Times Sq. But seating area more crowded than before," "Crazy lines out the door already," and "W 44th is open and mobbed!"

The new location, on 8th Avenue at 44th Street, features the usual favorites (Shack Burger, 'Shroom Burger) as well as Concrete shakes customized for the neighborhood: The Great White Way (Vanilla custard, marshmallow sauce, crispy crunchies), Pretzel! The Concrete (Chocolate custard, peanut butter sauce, chocolate covered pretzels, marshmallow sauce), and Jelly's Last Donut (Vanilla custard, Doughnut Plant donuts, strawberry preserves, cinnamon sugar).

Up next: A Shake Shack on East 86th Street.