Theyyy'rrrreeee baaaaack! Mr. and Mrs. Bieber are back in LA following their South Carolina wedding and now they're OFFICIAL!

Justin and Hailey enjoyed a movie date last night and Hails sent a message to the world ... she's a "wife" now, as the back of her jacket reads!

The pair got take-out from Hamburger Haven before the film and Justin wasn't in the best mood ... he snapped at the paps, at a fan, and looked super anxious. It's kinda uncomfortable ...