Let the 'Iron' Mania Begin!

The stars were out at the glitzy L.A. premiere of "Iron Man 2" Monday night -- and "Extra" was there to bring it to you!

There was the showdown between action heroes Sylvester Stallone and Robert Downey Jr. "Robert would knock me on my ass any day of the week," admitted Sly.

And then there was the fashion showdown between the Armani-clad leading ladies, Gwyneth Paltrow and Scarlett Johansson. "Oh, what, this old thing?" winked Johansson.

Vote in our Gwyneth/Scarlett face-off!

Check out more of the red carpet action!