Mariah Carey Then

Mariah Carey during her pregnancy. (credit:Jim Watson/AFP/Getty Images)

Mariah Carey Now

Mariah Carey flaunts her new body during a Jenny Craig photo shoot (credit: Cindy Ord/Getty Images)

Jerry Ferrara a.k.a. "Turtle" Then

Jerry Ferrara (credit: Peter Kramer/Getty Images Entertainment)

Jerry Ferrara a.k.a. "Turtle" Now

Jerry Ferrara (credit: Dimitrios Kambouris/Getty Images Entertainment)

Kirstie Alley Then

Actress Kirstie Alley attends the after party for Showtime's Premiere of "Fat Actress" at the Geisha House on February 23, 2005 in Hollywood, California. (Photo by Stephen Shugerman/Getty Images)

Kirstie Alley Now

A slimmed down Kirstie Alley in 2011. Andy Kropa/Getty Images Entertainment

Horatio Sanz

SNL actor Horatio Sanz arrives to the opening night of "Glengarry Glen Ross" at the Royale Theater May 1, 2005 in New York City. (Photo by Fernando Leon/Getty Images)

Horatio Sanz

Horatio Sanz at the Columbia Pictures world premiere of "Year One" at AMC Lincoln Square on June 15, 2009 in New York City. (Photo by Bryan Bedder/Getty Images)

Jennifer Hudson

Singer Jennifer Hudson performs at the 17th Annual Mercedes-Benz Carousel of Hope Ball at the Beverly Hilton Hotel on October 28, 2006 in Beverly Hills, California. (Photo by Kevin Winter/Getty Images)

Jennifer Hudson

Jennifer Hudson attends the Winnie Cocktail Party at Terrazza Martini during the 63rd Annual Cannes Film Festival on May 16, 2010 in Cannes, France. (Michael Buckner/Getty Images)

Kathy Ireland

Actress Kathy Ireland arrives at Chevy Rocks The Future at the Buena Vista Lot at The Walt Disney Studios February 19, 2008 in Burbank, California. (Photo by Mark Davis/Getty Images)

Kathy Ireland

Former Model Kathy Ireland arrives at the 82nd Academy Awards at the Kodak Theater in Hollywood, California on March 07, 2010. (Photo by Mark Ralston/AFP/Getty Images)

Jason Alexander

Jason Alexander poses at the Roundabout Theatre Company's 2004 Spring Gala Celebration at the Mandarin Oriental hotel, April 26, 2004 in New York, New York. The celebration includes a special musical tribute to John Kander and Fred Ebb. (Photo by Zack Seckler/Getty Images)

Jason Alexander

Jenny Craig client Jason Alexander makes his 30-pound weight loss debut during a press conference at The Pierre Hotel on May 17, 2010 in New York City. (Photo by Michael Loccisano/Getty Images for Jenny Craig)

Valerie Bertinelli

Actress Valerie Bertinelli arrives for the MGM Studios afterparty for the film 'Saved' which premiered at the 2004 Sundance Film Festival on January 21, 2004 in Park City, Utah. (Photo by Carlo Allegri/Getty Images)

Valerie Bertinelli

Valerie Bertinelli backstage at the Red Dress Collection 2009 fashion show during Mercedes-Benz Fashion Week at The Tent in Bryant Park on February 13, 2009 in New York City. (Larry Busacca/Getty Images for Swarovski)

Peter Jackson

Director Peter Jackson at the UK premiere of Lord of the Rings,The Fellowship at the Odeon, Leicester Square, London on December 11, 2002. (Photo by Dave Hogan/Getty Images)

Peter Jackson

Peter Jackson walks the red carpet during the The Lovely Bones Premiere at the Embassy Theatre on December 14, 2009 in Wellington, New Zealand. (Photo by Marty Melville/Getty Images)

Carnie Wilson

Carnie Wilson in 1995, before her well-publicized surgery to combat obesity. (Credit: AP)

Carnie Wilson

Recording artist Carnie Wilson attends the taping of the Hollywood Squares Game Show at the CBS Television Studios on February 9, 2003 in Los Angeles, California. The show will air the week of Mother's Day. (Photo by Frederick M. Brown/Getty Images)

Jonah Hill

Jonah Hill in June 2010 (credit: Brendon Thorne/Getty Images)

Jonah Hill

What a difference a year makes! Jonah Hill showed off his trimmed down new look in New York City in July 2011. (credit: Jason Kempin/Getty Images)