Jessica Simpson

While the singer has recently battled rumors of an expanding waistline, there is one thing she's admitted has plumped up: her lips! "I had that Restylane stuff," Simpson, 28, told Glamour magazine in 2006, adding that she was disappointed in the results. "It went away in like four months...[but] thank God! [They] looked fake to me. I didn't like that."

Lisa Rinna

Former Melrose Place star Rinna, 45, has admitted to having injections of Juvederm in both her cheeks and lips. "When you change your face, you don't look like yourself," Rinna (in L.A. last month) told Momlogic.com. "Looking fresher is one thing. I look like a freak! I always said I wouldn't change my face, but I did it."

Joan Rivers

Comedy vet Rivers, 75, has been outspoken about her multiple cosmetic surgeries, writing about her eye lift, nose job and breast augmentation in her 2008 book, Men Are Stupid...And They Like Big Boobs: A Woman's Guide to Beauty Through Plastic Surgery. "Looking good," Rivers writes,"equals feeling good ... I'd rather look younger and feel happy than look older and be depressed."

Tara Reid

The actress found it tough to score a job after going under the knife. Reid, 33, revealed to CBS News that her 2004 breast augmentation left her with deformed nipples and rippled skin. "My stomach became the most ripply, bulgy thing," she said. "I had a hernia, this huge bump next to my bellybutton. As a result, I couldn't wear a bikini. I lost a lot of work." Reid had the procedures reversed in 2006.

Janice Dickinson

America's self-proclaimed "first supermodel," Dickinson, 54, went under the knife for a breast enlargement, tummy tuck, both neck and face lifts, liposuction and Botox. After her surgeries, Dickinson's then 20-year-old son, Nathan, urged his mother to stop. "I won't do any more plastic surgery," Dickinson told U.K.'s Daily Mail in response. "if he's looking."

Jocelyne Wildenstein

Nicknamed "Catwoman" for her feline-like features, socialite Wildenstein, 62, first went under the knife in the 70's, fearing her millionaire husband would leave her if she did not change her look. Later, she admitted that the surgery was not an effort to maintain her marriage, but rather to pay homage to exotic wild cats, which her husband loved.

Pete Burns

The Dead or Alive singer, 49, is most famous for his song "You Spin Me Round," but is equally as known for his extensive cosmetic surgeries. Burns defended his choice to enhance his features to the Times Online, explaining that surgery is quickly becoming the norm. "Look how common [it] has become," he said. "It's the same with piercing: when I had my nose pierced in 1973, it was considered shocking. Now, housewives have everything pierced!"

Nikki Cox

Former Las Vegas star Cox, 30, showed off enhanced lips at the 2009 Grammy Awards last February.

Daryl Hannah

Photographed last month in Malibu with a visibly tighter, wrinkle-free facial structure, Splash actress Hannah, 48, fueled Internet rumors that she had gone under the knife.

Donatella Versace

The perpetually-tanned Italian designer, 53 (here last October at a Whitney Museum gala in NYC) has had lip injections and Botox.

Michael Jackson

Music's King of Pop, 50, has long been the subject of scrutiny over his looks -- the singer has had rhinoplasty, chin reshaping, and some eye surgery performed -- but Jackson says he doesn't understand the fuss. "All of Hollywood has plastic surgery" Jackson has said. "I don't know why they point me out. The press exaggerated it. It's just my nose, you know. They want it to be everything. Just the nose isn't enough."

Priscilla Presley

Former Dancing With the Stars contestant Presley, 63, was at the center of controversy when it was revealed her plastic surgeon, Dr. Daniel Serrano, was unlicensed. Presley was one of a handful of Serrano's patients who was injected with unsafe forms of silicone. The surgeon was jailed in 2006 for malpractice.