Bella Thorne & Tristan Klier: 'Fun Size' Sweeties

Bella Thorne cuddles into boyfriend Tristan Klier‘s side as they arrive at the premiere of Fun Size held at Paramount Studios in Los Angeles on Thursday night (October 25).

The 15-year-old actress tweeted to star Victoria Justice, “Congrats @victoriajustice on a job well done..from fl, to ny, to la…glad that i’ve known u so long!”

PHOTOS: Check out the latest pics of Bella Thorne

It was an extra special night too — Bella and Tristan celebrated their 11-month anniversary!

“Happy 11 month munchkin!!” Tristan wrote on Twitter.

15+ pics inside…