It is a part of any celebrity's life to work up their bodies to the best of their looks. Your favourite stars look too perfect to even discover that they still have their own insecurities that they keep to themselves.

Do you think that the revelation of their own weaknesses signify their guts and courage or are they just playing it humble?

Katy Perry may seem too perfect and secure with her hot body, but the singer once admitted that she was not too proud with her bust back in high school. The 'Part of Me' singer also once dreamed of having the body of Kate Moss.

Kim Kardashian never loved her thighs, which she thinks are 'too big.' She also gets to adore her tummy better after each work out. What's admirable about the Kardashian sisters is the way they maintain their poise even after the recent Kim Kardashian flour bomb scandal.

Kelly Rowland once hated her dark skin. But eventually, the ex-Destiny's Child member realized how sexy she can be even in her own skin, literally.

Angelina Jolie may have all the luck in the world with having gorgeous kids and a handsome husband in Brad Pitt, but sources say she once took it hard with the body changes after her twins were born.

Keira Knightley does not have any plans to reveal her behind on the big screen. The 'Pirates of the Caribbean' actress is not too confident with the bottom half part of her body.

Check out the slideshow for more celebrity revelations.

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Kim Kardashian is not a big fan of her thighs.

U.S. actress Megan Fox poses for photographers as she arrives to attend the Emporio Armani Spring/Summer 2011 women's collection during Milan Fashion Week

The former Spice Girl member once doubted her saggy tummy skin after she gave birth.

The beautiful Sofia Vergara has been getting more attention than usual lately because of photographs that surfaced of her body painting with her friend, Spanish-American artist Domingo Zapata. Because of the planned nature of the photo shoot, she'll be able to avoid the embarrassment that's plagued the Duchess of Cambridge since the eruption of the Kate Middleton topless-photo scandal.

Jennifer Aniston thinks her behind is way too big for her frame.

Vanessa Hudgens’ career has had some ups (“Sucker Punch,” “Bandslam”) and downs (“Journey 2: The Mysterious Island,” “Beastly”). She will soon be seen in a Precious-type role in “Gimme Shelter,” playing a homeless pregnant teenager. She’ll also star in “Spring Breakers” alongside fellow Disney alumna Selena Gomez.

Natalie Portman