Singer-actress everywhere we look with new album, movie -- and we're not complaining.

When you're hot, you're hot, and Beyoncé Knowles is on fire right now.

Not only does the multi-talented performer have a new album out ('I Am...Sasha Fierce'), with two hit singles, and a hilarious viral video making the rounds thanks to 'SNL,' she'll soon be making waves again in movie theaters, too.

Knowles plays songstress Etta James in the Leonard Chess biopic 'Cadillac Records,' hitting theaters December 5. The red-hot pop star linked up with AOL Music to record a live performance that included tracks from 'Sasha Fierce' as well as "At Last," the first single from the 'Cadillac Records' soundtrack. Watch 'At Last' here, then check out the full Sessions on AOL Music.