While other stars gate-crash rehab prior to their 21st birthday, it’s a toast of legal libation to Shia LaBeouf, who’s already notched a big hit with this spring’s Disturbia, gets his voiceover ya-yas out with the above-average animated surfing-penguin flick Surf’s Up, and still has some intimate indie chamber drama called Transformers waiting in the wings later this summer. Good times, kid…