Ariana Grande keeps it classy in a sleek LBD as she arrives at the 2010 Tribeca Film Festival opening night premiere of Shrek Forever After at the Ziegfeld Theatre in NYC on Wednesday night (April 21).

The 16-year-old actress tweeted about her impression of the fourth Shrek film, saying, “Had so much fun at Shrek! Congrats to the amazing cast :) It was so funny! I laughed sooo hard. By the way… Shrek was so romantic.. I have a new celeb crush hahah.”

Be sure to tweet your questions for Ariana to Zach Sang — he’s having her on his show FRIDAY!

10+ pics inside of Ariana Grande…