The 46th annual Academy of Country Music Awards show is right around the corner, with star power for the big event continuing to rise. Oscar-winner Reese Witherspoon and Hollywood heartthrob Robert Pattinson are the latest two celebrities to join the cast of presenters for the awards ceremony.

The actors, who appear together in the upcoming film 'Water for Elephants,' join 'American Idol' host Ryan Seacrest and Nancy O'Dell from 'Entertainment Tonight,' who will also be on hand as presenters. Performers during the three-hour broadcast include Dierks Bentley, Carrie Underwood, Ronnie Dunn, Sara Evans, Martina McBride and the Zac Brown Band with James Taylor, as well as Reba McEntire and Blake Shelton, who will also act as the evening's co-hosts.

More performers and presenters are expected to be announced at a later date. The ACM Awards will air live from Las Vegas at 8:00 PM ET on CBS. Miranda Lambert leads the pack of nominees with seven nods this year. See the full list of 2011 ACM Awards nominees here.

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