Sienna Miller has said she has no worries about Keira Knightley as a mother and is sure her pal will be a natural.
The actresses have apparently been in touch a lot since it was revealed that Keira was expecting her first child, and Sienna reckoned she would make a great mum.
Sienna told Page Six: "We've spoken a lot and I know she will be amazing."
She added that Keira wouldn't need any tips on what to do with her new baby when it arrives: "She doesn't need any advice. She will be perfect."
Keira is reportedly expecting her first child next summer with Klaxons star husband James Righton.
Sienna has a two-year-old daughter, Marlowe, with actor Tom Sturridge.