Sienna Miller says 'perfect' Keira Knightley doesn't need parenting advice

Sienna Miller has recently expressed that Keira Knightley doesn't need any parenting advice, as she is already doing a perfect job

The 32-year-old said that Knightley, who is expecting her first child with James Righton, already knows what she's doing, New York Post reported.

But still Miller has been offering 'Last Night' star advices on motherhood.