The first round of voting for the MTV Movie Awards 2010 is open now.
Per the MTV site:
Voting will run through 6 p.m. ET on Friday, April 9. After the nominees are announced, voting for a winner in each category will start May 11 and run through June 5.
Click on the category to be taken to each voting page:
Oddly Zac isn't listed, but you can write him in at the bottom of the page.