Keira Knightley doesn't need parenting advice: Sienna Miller

'The Girl' star Sienna Miller feels actress-friend Keira Knightley, who is expecting her first child with husband James Righton, does not need parenting advice.

Miller, 32, has a two-year-old with actor Tom Sturridge, reported the New York Post.

"We've spoken a lot and I know she will be amazing. She doesn't need any advice. She will be perfect," said Miller.