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Can You Guess How Old Are They?

Dakota Fanning – 14 years
Can You Guess How Old Are They?

Who’s that woman – err – girl? Tinseltown’s underage set is looking older than ever thanks to high-end hair, makeup and fashion. Check out the starlets who’ll leaving you wondering, "She’s how old?!"

Can You Guess How Old Are They?

Dakota Fanning isn’t so little anymore … kinda. The 14-year-old debuted a more adult wardrobe in recent months.

Hayden Panettiere – 19 years
Can You Guess How Old Are They?

"Heroes" actress Hayden Panettiere’s red carpet attire makes her appear closer in age to her 31-year-old boyfriend, Milo Ventimiglia.

Can You Guess How Old Are They?
It’s hard to believe Panettiere’s only 19.

Can You Guess How Old Are They?
The teen star’s one of the youngest members of the "Heroes" cast.

Demi Lovato – 16 years
Can You Guess How Old Are They?
Disney star Demi Lovato’s just 16.

Can You Guess How Old Are They?
Can you believe it?!

Taylor Swift – 19 years
Can You Guess How Old Are They?
Taylor Swift: 19 going on 30?

Can You Guess How Old Are They?
The country singer often dresses …

Can You Guess How Old Are They?
… and performs for a mature audience.

Emma Watson – 18 years
Can You Guess How Old Are They?

"Harry Potter" star Emma Watson, 18, has grown up in the limelight – and developed a taste for high fashion.

Can You Guess How Old Are They?
Little Hermoine Granger doesn’t look so little anymore!

Can You Guess How Old Are They?

Watson often wears Chanel and Alexander McQueen, among other designers.

Emma Roberts – 17 years
Can You Guess How Old Are They?

She covers up, but it’s hard to believe "Hotel for Dogs" star Emma Roberts is just 17.

Can You Guess How Old Are They?

Julia Roberts’ niece is slowly trying to cultivate an adult image.

Can You Guess How Old Are They?
Is it working?

Miley Cyrus – 16 years
Can You Guess How Old Are They?

"Hannah Montana" star Miley Cyrus’ "tarty" fashion sense makes her looks like she’s 25, "Project Runway" host Tim Gunn told OK! magazine. "I don’t want her to look like she’s going into a convent school, but it’s just a little too much for a 15-year-old," he said.

Can You Guess How Old Are They?

The 16-year-old is slowly angling for a more adult image …

Can You Guess How Old Are They?
… and even dates a 20-year-old!

Selena Gomez – 16 years
Can You Guess How Old Are They?

Cyrus’ alleged rival, Selena Gomez, often appears to be in her mid-20s thanks to hair extensions and designer duds.

Can You Guess How Old Are They?

The Disney star tries working girl chic on for size

Can You Guess How Old Are They?
Did we mention she’s 16?

Ireland Baldwin – 14 years
Can You Guess How Old Are They?

Ireland Baldwin – daughter of Kim Basinger and Alec Baldwin – is just 14.

Can You Guess How Old Are They?

Ireland looks like her daddy’s date at the SAG awards.

Taylor Momsen – 15 years
Can You Guess How Old Are They?

She’s just 15, but Taylor Momsen’s older-than-her-years style is already turning heads in New York.

Can You Guess How Old Are They?

The "Gossip Girl" star is a red carpet regular in the Big Apple.

Can You Guess How Old Are They?

Momsen often parties alongside her older co-stars.

Ali Lohan – 14 years
Can You Guess How Old Are They?

Ali Lohan raised eyebrows in August when she attended a Jonas Brothers concert wearing a low-cut tank top and heavy makeup. CNN’s Anderson Cooper later joked that the teen is "allegedly a 14-year-old girl."

Riley Keough – 19 years
Can You Guess How Old Are They?

Riley Keough, Elvis’ granddaughter, made her runway debut at age 14. Now 19, the catwalker has worked for Victoria’s Secret, Tommy Hilfiger and Dior, among others.

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