Hal Rubenstein's Oscar Fashions

L O S   A N G E L E S, March 25 -- Who won, and more importantly, what were they wearing?

Every year InStyle magazine's fashion director, Hal Rubenstein joins ABCNEWS' Good Morning America the day after Hollywood's biggest party to give us the low down on the best and the worst of the beads and bodices.

"Expectations were really, really high this time because there were over a dozen of Hollywood's prettiest, youngest, and just everyone in fashion, everyone in movies waswaiting to see how this parade was going to go," Rubenstein said.

This year makeup and hair really captured the biggest stars' overall looks, more than their designer frocks. Some celebrities went with a romantic look, while others opted for "big hair," and some didn't bother at all.

"Despite fashion mags decreeing flat, straight hair the thing, Jennifer Lopez wasn't havingit. She was going big '80s. Gwyneth Paltrow went with the 1880s, and Cameron Diaz, well, she just canceled her appointment," Rubenstein said.

Rubenstein didn't dig Diaz's do — and her dress didn't win any praise from him either. "I don't know, this girl's got something against awardshows. She's fighting this thing tooth and nail."

Gwyneth Revealed

But Diaz wasn't the worst dressed, Rubenstein reserved that position, with reservation, for a Best Actress winner from Oscars past.

"It just kills me to say Gwyneth Paltrow because she's just so radiant, beautiful," Rubenstein said. "She's done so much to help fashion and movies, but last night she just made a mistake." Paltrow's make-up was applied with a heavy hand, but she could have used a bit of cover-up a few inches lower. Her sheer Christian Lacroix tank dress in steel gray showed off a lot, without much support.

Who looked just perfect in Rubenstein's eyes? A young Hollywood actress, with very little experience on the red carpet."Eat with a spoon, delicious from head to toe, Reese Witherspoon (pictured at top of story) is giving Hollywood a fresh definition in poise and style," Rubenstein said.Witherspoon, who appeared in Legally Blonde last year — not an Oscar-nominated film — wore a black cap sleeve dress with black lace trimming at the bottom.