Academy Award winner Reese Witherspoon and Robert Pattinson are scheduled to present together on the 46th Annual Academy of Country Music Awards, the academy announced today.

The ACM Awards will be broadcast live from the MGM Grand in Las Vegas at 7 p.m. Sunday, April 3 on the CBS Television Network. Hosted by Oklahoma natives and country music stars Reba and Blake Shelton, the ceremony honors country music’s top talent as well as the industry’s hottest emerging artists.

Nancy O’Dell and Ryan Seacrest also will be presenters on the ACM Awards.

In addition, Alabama, Dierks Bentley, Ronnie Dunn, Sara Evans, Martina McBride, Reba, Blake Shelton, Carrie Underwood and Zac Brown Band with James Taylor and Entertainer of the Year nominees Jason Aldean, Toby Keith, Miranda Lambert, Brad Paisley, Taylor Swift and Keith Urban have been announced as performers.

Witherspoon is best known for her Academy Award-winning portrayal of country music singer June Carter Cash in the 2005 film, “Walk the Line.” Pattinson is best known for his portrayal of vampire Edward Cullen in the “Twilight” saga. In April, Witherspoon and Pattinson will co-star in the feature film, “Water for Elephants.”

Nancy O’Dell, “Entertainment Tonight’s” Emmy Award-winning journalist, has proven to be a force in all areas of her career as a host, author, producer and entrepreneur. Currently Special Correspondent, O’Dell will assume the role of co-anchor of “Entertainment Tonight” after Mary Hart ends her final season in May 2011.

Ryan Seacrest is at the forefront of the media and entertainment industry. Seacrest is celebrated internationally as host of “American Idol,” and hosts and produces E! News as well as its red carpet awards show coverage. He also serves as an executive producer and co-hosts “Dick Clark’s New Year’s Rockin’ Eve with Ryan Seacrest.”