A big theme of this year's Oscars is "old Hollywood," and many celebrities walking the red carpet tonight have taken that theme and run with it -- especially when it comes to their hairstyles!

Some ladies who have ditched the tightly-pinned, prom-style up-dos in favor of classic, glamorous, "old Hollywood" waves include Bridesmaids star Maya Rudolph and The Help star and Oscar nominee Jessica Chastain.

Check out our photo gallery of actresses who are rocking the 'do on the red carpet after the jump!