http://www.popmatters.com/pm/article/65678-oscar-could-use-a-big-hit/

About halfway down the page:

'Other A-listers on short lists for Oscar contention include Nicole Kidman, Brad Pitt, Clint Eastwood, Will Smith, Angelina Jolie and, seriously, Beyonce Knowles for her role in “Cadillac Records.”'

I guess she really did good in this movie then!

I'm kind of upset she's only in it for about 30 minutes towards the end though. :/