We all have our secret celeb crushes - even Selena Gomez.

The Disney darling, 18, posted a super cute video on YouTube on Tuesday showing her surprise run-in with actor Shia LaBeouf backstage at a TV studio.

"Oh my gosh," Gomez - looking utterly embarrassed - said out when she unexpectedly ran into the Transformers star.  "I'm so sorry to bother you," she said.