The 2006 MTV Movie Awards will filmed June 3 and broadcast on the music network June 8.
Alba is nominated in the categories of Best Hero and Best On-Screen Team for "Fantastic Four" and Sexiest Performance for her role in "Sin City," MTV said in a news release.
"The MTV Movie Awards is like a three-ring circus and I'm thrilled they asked me to be this year's ringmaster," Alba said n a statement.
Alba had a busy 2006, starring in "Sin City," "Fantastic Four" and "Into the Blue."
The MTV Movie Awards are decided by movie fans. Votes are being accepted through May 19.