In today's "casting news that makes you go 'Oooo,'" Robert Pattinson and Sean Penn are in talks to star in the film adaptation of Water For Elephants, the Great Depression-era story by author Sara Gruen. The novel follows a veterinary student who leaves his schooling after his parents are killed, and instead takes up with the circus. He "sees the brutality of circus life while falling for the wife of an abusive animal trainer." Reese Witherspoon is already attached to the project; throw Penn in, and Pattinson has officially landed himself in legit A-lister territory.Assuming that Pattinson plays the lead role and Witherspoon and Penn are the married couple, it sounds like Reese and Robert will be a pretty interesting (pretty hot?) onscreen couple. Do you think Pattinson has the talent to keep up with acting heavyweights like Oscar winners Penn and Witherspoon?