‘The Duchess’ star beat ‘Wanted’ actress Angelina Jolie to the number one spot in a public survey by lip care company Blistex.
Keira, 23, has previously said she doesn’t think her pursed lips are attractive, claiming it makes her look like she is having trouble with her bowel movements.
She said: “I don’t pout to be sexy. I do it when I’m concentrating. I think it makes me look constipated.”
Pop princess Kylie Minogue took third place in the poll of 3,000 women.
The worst pout slot went to British actress Leslie Ash, who suffered an allergic reaction to collagen injection. She was closely followed by troubled singer Amy Winehouse and British glamour model Jodie Marsh.
Keira has recently claimed she would be terrified if she had to give an Oscar acceptance speech.
She said: "I would probably s**t myself if I had to give a speech."
Blistex poll of the top 10 perfect pouts:
1 Keira Knightley
2 Kylie Minogue
3 Angelina Jolie
4 Scarlett Johansson
5 Victoria Beckham
6 Jennifer Aniston
7 Kelly Brook
8 Cameron Diaz
9 Jessica Alba
10 Charlotte Church
Blistex poll of the top 10 worst pouts:
1 Leslie Ash
2 Amy Winehouse
3 Jodie Marsh
4 Heather Mills
5 Victoria Beckham
6 Cherie Blair
7 Eva Longoria
8 Katie Price
9 Jocelyn Wildenstein
10 Joan Rivers