London, Dec 31: X Factor judge Cheryl Cole and High School Musical actor Zac Efron have been named the ''coolest celebrities among teenagers''.
In a poll involving more than 20,000 teenagers, The Girls Aloud star received four times as many votes as any other female celebrity.
Harry Potter star Emma Watson, 18, came second followed by television presenter Alexa Chung, 25.
Singer Lily Allen, 23, landed at the fourth position with troubled actress Lindsay Lohan, 22 at the fifth.