6 stars who've changed their face

Renee Zellweger has joined the many celebrities who have gone under the knife over the years. Photos / Getty Images

Renee Zellweger had some work done, and social media went crazy. Most significantly, she had the shape of her eyes changed from almond to oval - making them appear wider.

Zellweger's look was so different, that many thought she was completely unrecognisable.

Before and after: Renee Zellweger in 2000 and in late 2012. Photos / Getty Images

Zellweger is by no means the first celebrity who had radical plastic surgery to completely alter their look. Here are six other celebrities who changed their face.

1. Jennifer Grey

If you grew up around the same time I did, you will know Jennifer Grey from Dirty Dancing. The film enjoyed amazing success and it was meant to be the start of big things for Jennifer. However, after two rhinoplasty procedures, she was hardly recognisable. "I went in the operating room a celebrity - and came out anonymous," she is said.

"It was the nose job from hell. I'll always be this once-famous actress nobody recognises because of a nose job."

Before and after: Jennifer Grey in October, 1986 and May 2014. Photos / Getty

2. Kirstie Alley

The Cheers star's look has changed many times over the years, mainly because of her fluctuating weight. Although she insists she has never has any surgery, botox or fillers, many believe her arched browline and stiff forehead must have gone under the knife or needle.

Before and after: Kirstie Alley as Rebecca Howe in Cheers, and on The Tonight Show with Jay Leno in 2013. Photos / Getty Images

3. Mickey Rourke

During the 1980s Mickey Rourke was considered a handsome leading man, starring in films such as Rumble Fish and Diner. Rourke underwent a number of botched reconstructive surgeries following years of boxing and boozing. Unlike many Hollywood stars, Rourke freely admits to having surgery.

Before and after: Actor Mickey Rourke circa 1989, and in Beverly Hills on September 20, 2014. Photos / Getty Images

4. Melanie Griffith

Melanie Griffith is another star who has never admitted to having any work done. However, her changing face over the years suggest she has had multiple face-lifts, fillers, lip and breast augmentation and liposuction.

Before and after: Melanie Griffith poses during a 1987 Los Angeles photo portrait session and at an event on October 15, 2014 in Beverly Hills. Photos / Getty Images

5. Bruce Jenner

During the 1970s, Bruce Jenner was an American Olympic champion, these days he's known as Kris Jenner's ex, and rumoured to be going through an identity crisis. Jenner has been open about his plastic surgeries, including a procedure to shave off some of his adam's apple that he underwent earlier this year.

Before and after: Bruce Jenner during Easter Seals Telethon March 25, 1979 and at an event in New York City on September 11, 2013. Photos / Getty Images

Gallery: Bruce Jenner through the years

Image 1 of 6: September 1993: Bruce and Kris Jenner at the opening of the US soccer HQ in California. Photo / Getty

Mobile users tap here to view a gallery of Bruce Jenner through the years.

6. Heidi Montag

The former Hills star famously underwent 10 procedures in one day during 2010, including a breast augmentation to an F-cup, which she has since had reduced. Heidi has spoken openly about her marathon surgeries, and regrets.

Before and after: A young Heidi Montag in 2002 and at a birthday bash for Spencer Pratt's 30th birthday on August 31, 2013 in Las Vegas, Nevada. Photos / Getty

-nzherald.co.nz