#15 Keira Knightley Once upon a time our favorite character from Pirates of the Carribean would not have even gotten an audition. Good thing Keira went from beast to beauty.
#14 Scarlett Johansson Scarlet Jo was a tomboy as a kid, and to young boys a tomboy is the definition of an ugly duckling. Her classmates are kicking themselves for not making her their wifey back in the 4th grade.
#13 Russell Brand Russell Brand started off looking like Tony Soprano's driver and now looks like....Russell Brand. The ultra skinny, tattooed funnyman looks nothing like his childhood self.
#12 Nicole Kidman Nicole Kidman was not a hideous child, but her afro puts her in rare company when it comes to celebrity transformations. You could take a machete to that thing without making a dent.
#11 Natalie Portman Natalie Portman was a child star, but a whiny, unattractive one at that. Then she became Natalie Portman, man eater.
#10 Miley Cyrus As the daughter of a famous rock star, Miley Cyrus was probably thrust into the spotlight as a lanky, awkward little girl. As she grew up, we saw her famous genes evolve into a beautiful young corrupter of little girls.
#9 Kristin Stewart Alot of kids who bumped into Kristin Stewart in the elementary school hallway turned and said "Sorry Bro". They were not trying to be mean, they were sincerely mistaken.
#8 Christina Aguilera You could say that Christina Aguilera was a Geenie in a Bottle of Sorts. As a child she was hidden from the world, just an awkward tween bubbling with talent. Then, ALAKAZAM! she was a curvalicious pop sensation taking over the nation!
#7 Britney Spears Britney Spears is sexy, buzz cut or no buzz. However, if you ran into her during elementary school you probably would not pick her out as the future superstar.
#6 Hilary Duff Hilary Duff might not be considered ugly as a child, but she certainly was not hinting at the knockout she would become. Today Hilary is one of the hottest women on Earth, a far cry from her days as Lizzie McGuire.
#5 Jaleel White Or as you probably know him, Urkel. Urkel played Urkel because he was the biggest dweeb on Earth-rail thin, huge glasses, no macho bravado. As he has grown up and lost his celebrity, he has worked hard to shed the nerdy image.
#4 Joshua Jackson Jackson established himself as a hearth throb as the sensitive video camera-toting creep next door in American Beauty. Clearly he did not audition for the role until he was done with puberty.
#3 Adam Lambert has truly embraced his homosexuality, which means we seem him with heavy makeup on 90% of the time. Even with the makeup, we can tell Lambert has come a long way since his chunky days.
#2 Christina Ricci Ok, we know this is from the Addams Family and she was meant to look scary, but she really was an ugly duckling. Now, she is a bona fide bombshell.
#1 Kate Hudson Kate Hudson is the daughter of fellow knockout Goldie Hawn, and you would think she might get her Mom's good looks from a young age. It took some time to develop, and we're glad she did.
Source: http://likes.com/celebs/more-ugly-duckling-celebs