That's definitely Vanessa Hudgens getting motorboated

Zac Efron is totally motorboating Vanessa Hudgens.

Link : http://www.collegehumor.com/out2/6385/url/www.egotastic.com/entertainment/celebrities/vanessa-hudgens/more-vanessa-hudgens-bikini-pictures-zac-and-vanessa-go-motorboating-003831