Vanessa Hudgens, Shailene Woodley, More Reveal Red Carpet Don'ts

'Absolutely do not be drunk or high on anything,' Dame Helen Mirren advises MTV News in latest edition of Don't Do That.

With awards season is in full swing — Oscar nominations were announced on Tuesday, the Screen Actors Guild Awards are set for Sunday — the stars have been stepping up their fashion game in hopes of taking home one of the most important honors: Best Dressed.

But a lot of work goes into making that coveted list. MTV News asked some of the biggest actresses in the business for advice on what not to do on a red carpet.

"Don't wear something that's uncomfortable," said "Descendents" star Shailene Woodley when asked about how to leave a lasting impression. "Wear something that's super comfortable."

Hudgens had some unusual advice for what not to do on the red carpet. "A cartwheel ... in a dress," she said.

Comfort may not have been at the top of the list for Reese Witherspoon and Charlize Theron, who wowed at the 2012 Golden Globes, but they were certainly dazzling. Similarly, young starlets like Demi Lovato and Vanessa Hudgens made daring fashion choices at the People's Choice Awards and came out winners.

"The Help" star Jessica Chastain — who just got her first Oscar nomination for Best Supporting Actress — seemed to agree with Woodley.

"You should never wear something that makes you uncomfortable because then you look uncomfortable," Chastain said. "We've all done that, right? We've all been talked into something we didn't love, by our grandmothers, our aunts, my great aunt."

Chastain's fellow Oscar nominee and "Help" co-star, Viola Davis, has a busy red-carpet season ahead of her, but don't expect her to strike a pose. "My big thing, I never do over-the-shoulder shots," Davis told us. "I just don't. I think they're cheesy.

"I think absolutely you should be who you are, it has a huge calming effect as opposed to adding anxiety to yourself and trying to channel another persona; it really doesn't work," the Best Actress nominee continued. "Can you imagine the over-the-shoulder, hair-flip kinda pose for myself?"

Of course, it's not just about the dress or the most flattering pose — viewers keep an eye on carpet etiquette, too. According to Dame Helen Mirren, a star should always be on their best behavior.

"Don't be drunk, absolutely do not be drunk or high on anything," Mirren said. "Don't be nervous and do enjoy it. Think [to yourself], 'This is crazy, this is ridiculous, it's absurd, it has absolutely no place in the modern world. I'm just gonna love it.' "

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