As we age, our appearance goes through drastic changes, and celebrities are no different. While time hasn't been kind to some celebrities, others seem to barely age at all. In spite of their best efforts, even the brightest of stars sometimes lose their shine, while others are looking back at their younger days laughing at their former images or style choices. Whether their style has changed drastically over the years, or due to the effects of time, these A-listers go through some pretty unbelievable physical changes throughout their careers. Join us on a journey through time as we look back on these celebs, then and now.

Emma Watson

In 1999 at the age of 9, Emma was cast as Hermione Granger in the film Harry Potter and the Sorcerer's Stone. Fans have enjoyed watching Emma blossom throughout her career into the Hollywood star she is today.

Macaulay Caulkin

You might know Macaulay Culkin as the adorable child star of the 1990 film Home Alone. Recent photos, however, have shown us an emaciated and unwell version of the former child star.

Demi Moore

Demi Moore was a huge star in the 80s, whose latest claim to fame appears to be marrying -- and then divorcing -- Ashton Kutcher, who is 15 years her junior. Today, Demi's arguably looking even younger than she did in her heyday.

Joseph Gordon Levitt

Joseph Gordon Levitt wasn't always the heartthrob he is today. In the early days of his career, he was an adorable child actor who had bit roles on sitcoms such as Roseanne and Family Ties before landing a full-time spot on Third Rock from the Sun in 1996.

Miley Cyrus

Once the spunky pre-teen title character of the Disney hit show Hannah Montana, Miley Cyrus was America's Sweetheart. Over the last decade or so, however, Miley'sundergone a total style transformation that's left many of her fans totally shocked.

Jennifer Lopez

Since the start of her career in the mid-'90s, J-LO has traded her curly locks and natural look to become the sleek fashionista she is today, and like many of Hollywood's A-listers, she hasn't aged a day.

Avril Lavigne

From Canada's punk-pop princess to Hollywood starlet, Avril Lavigne is one of the Canadian exports our neighbors to the north should be proud to call their own.

Jim Carrey

From goofy comedy star to sophisticated actor, artist, and advocate for immigrant rights, Jim Carrey's transformation goes way beyond the surface.

Geena Davis

Known best for her fantastic performance in the 1991 film Thelma and Louise, Geena Davis was once acclaimed for her looks and style. Today, however, her appearance is considerably less glam.

Zac Efron

This star of High School Musical has gone from scrawny teen to one of the hottest men in entertainment, right before our eyes.

Khloe Kardashian

When we first laid eyes on Khloe Kardashian, her awkward style and natural look were far from what we see today. The reality star now exudes style and glamour in every Snapchat, Instagram photo, and TV series we see her in.

Charlie Hunnam

When Charlie Hunnam started working in show business he was awkward, skinny and barely out of his teen years. Today, though, he's well known for his good looks and buff physique.

Renee Zellweger

Though rumors of plastic surgery plagued Renee Zellweger following a 2014 awards show at which she looked completely unrecognizable, the star still appears to be aging with grace, and attributes the change to weight loss and healthier living.

Lindsay Lohan

Former child star Lindsay Lohan experienced some hard times at the peak of her fame, including DUIs, eating disorders, and alleged drug abuse. All that fast-paced living seems to have taken its toll, and Lindsay looks far older than she really is.

Justin Bieber

Justin Bieber came onto the scene as a fresh-faced teenager. In his adult years, however, he's made some big changes to his physique, not to mention his overall image.

Nicki Minaj

Rapper/actress Nicki Minaj has come a long way since her humble beginnings as a Myspace artist. Today, she's known for her sultry curves, bleach blonde locks, and pink everything.

Eminem

Eminem may have done away with his signature bleach-blond locks and oversized clothes and traded them in for a slightly more mature, low-key look, but he's still identifiable as one of America's top rap artists.

Beyonce Knowles

Beyonce has had a serious style makeover since her Destiny's Child days. These days, the performer, mother of three, and wife of hip-hop superstar Jay Z always exudes the American royalty attributed to her.

Ice Cube

From gangster rapper to film star, Ice Cube's come a long way since we first heard his name in the mid-80s. The former member of NWA is now a grandfather whose career focuses primarily on acting.

Raven-Symoné

Raven-Symoné got her start on The Cosby Show at the tender age of 3, playing the role of Olivia, and went on to star in her own show on the Disney Channel, That's So Raven. Since her days with Disney, Raven has grown up, a lot.