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MILEY CYRUS
Age: 15
The Phenom

What's it like to have millions of Hannah Montana viewers watch your teen years unfold on TV?

Miley: "It's harder. I've had my awkward stage, but luckily everyone sees me with my makeup on. I'm starting to come out of it. When I had dark hair I was going through a hard time. I wanted to experiment. I was fighting with the person who had liked my highlights, so I said, 'Darn it, I'm going to be a pasty little black-haired freak, and I don't care what you have to say about it!' I was just trying to find who I am."

Tish Cyrus (her mom): "The kids realize that she is just like them, going through the same things."

Miley: "Okay, Mom ..."

Tish: "The critics need to chill out."

Miley: "Why don't you let me talk, Mom? So, what I've learned is that you don't have to be stuck to being one thing. When I do change my look, I think it's fun."

ASHTON KUTCHER
Age: 30
The Practical Joker

The best advice you've heard regarding your appearance?
"Looks fade. Don't get too attached."

Has your wife, Demi Moore, turned you on to any product you now can't live without?
"The only thing I can't live without is her."

MARY J. BLIGE
Age: 37
The No-Drama Queen

Her latest CD, Just Fine, reflects just how Blige feels looking in the mirror.

I'M AT MY MOST BEAUTIFUL when I'm in a good mood, not dealing with any drama, and feeling healthy.

THE BEST BEAUTY TIP I'VE EVER RECEIVED was to stand with my shoulders back on the red carpet.

TO LOOK FAB IN A PINCH I put on eyeliner and mascara and some liner on my mouth and some gloss in the middle, and that's the perfect five-minute face.

WAKING UP TO REALITY
We asked the stars of MTV's The Hills to take pictures of themselves straight out of bed, first thing in the morning

AUDRINA PATRIDGE
"When I wake up I love how I look—my skin can breathe. On the weekend I usually wake up at 10 or 11. That day, my sister came, and we went shopping."

WHITNEY PORT
"Once I open my eyes, I'm up. I have to have breakfast right away. So I eat—granola, yogurt and coffee—and then brush my teeth. We don't have hair and makeup on the show; we have to come ready."

LAUREN CONRAD
"Chloe, my puppy, wakes me up. I sit in my sink when I do my makeup, that's why I'm so close to my mirror. Under my eyes I use mark Speedway cover-up," says Conrad, who endorses the line. "It's great, especially since I don't always get that much sleep."

HEIDI MONTAG
"I wash my face and shower at night, and then wake up with 'whatever' hair in the morning. I like not having any products on my face." Really? We asked Heidi to be her own photog, but she appears to have been her own glam squad too. Or did Spencer lend a hand?

NORAH JONES
Age: 29
The Crossover

A revelation from the low-maintenance nine-time Grammy winner and star of the film, My Blueberry Nights:
"I'm addicted to ChapStick. I don't like my lips to be dry. If I leave the house without it, I have to buy some. I have to go to the bodega. I have tubes hidden around the house. I'd prefer to lose my cell phone than my ChapStick!"

CARRIE UNDERWOOD
Age: 25
The Country Sweetheart

She still gets nervous on the red carpet:
"I feel more beautiful when I see the pictures after. I'm like, 'I wish I had felt like I looked like that when I was actually there.'"

But there's one place the Grammy-winning "All-American Girl" singer lets loose: onstage.
"I play with my hair and put on neon green eye shadow and it doesn't really matter—you're a character!"

KATE BECKINSALE
Age: 34
The Brit Import

She made her movie debut at 18, but she says, "I'm happiest with myself now, in my 30s." Not only because she was a "weird-looking" kid. "I had my daughter Lily young, so now that she's 9, I'm not getting up seven times a night like all my friends," she says, adding that a "comfortable relationship" with director husband Len Wiseman helps her feel at ease. Plus, she jokes, "I've finally grown into my teeth!"

JOSH GROBAN
Age: 27
The Crooner

His shaggy do is as much part of Groban's fame as his lush baritone. But to him it's just practical: "My ears stick out."

Record execs told him, "'Cut your hair! Look at Nick Carter!'

But I was like, 'No. Please.'"

When he does get a trim, "I try not to go over $2,000," he says, and pauses.

"I'm kidding! Never above $100."

Get exclusive video of Josh, only at PEOPLE.COM/MOSTBEAUTIFUL

CHRISTINA APPLEGATE
Age: 36
The Comeback Kid

BEAUTY ADDICTION
"On Samantha Who? they airbrush my makeup on. Now I don't want to do anything without that—it's quick and it's good. I want to get out of the makeup chair as soon as possible. I'm so low-maintenance."

FAVORITE ON-THE-GO TIP
"You know those half-moon-shaped gel things? They are cobalt blue and you put them under your eyes to banish the bags. I use those every morning in the car. I have a convertible and I'm sure people are wondering what is going on with those things under my eyes."

SARAH SILVERMAN
Age: 37
The Funny Honey

The comic, who dates Jimmy Kimmel (and, um, paired up with Matt Damon), gives insight into her allure.

"I grew up in New Hampshire and everyone was very blonde and people would be like, 'Are you from New York?' I was just hairy! I used to bleach my arm hair. And it hurt so much. You don't know suffering for beauty until you're sitting on the floor of your bathroom, weeping, with white cream on your arms."

"I was a late-developer. I didn't even get my period until I was 17 1/2. I want that in People magazine!"

"I'm not a fancy person, but I do always wash my face twice, at night."

"Thank God for Jimmy, because all the things I don't like about myself are the things that he likes the most. Like my inner thigh fat. He grabs it and he's like, 'I love this!'"

"It sounds corny, but when I'm with my comedian friends, I just feel good. I'm lucky because I feel way more beautiful than I really am."