Robert Pattinson: ACM Awards Presenter with Reese Witherspoon!

Robert Pattinson gets the giggles on stage as he presents an award during the 2011 ACM Awards held at the MGM Grand Garden Arena on Sunday (April 3) 2011 in Las Vegas.

Joined by Water For Elephants costar Reese Witherspoon (wearing Brian Atwood heels and Neil Lane jewels), they presented Miranda Lambert with the Top Female Vocalist of the Year award.

Earlier in the day, Robert and Reese were in Los Angeles promoting Water For Elephants at a press conference.