Channing Tatum has been calling Sienna Miller for baby advice. The 32-year-old actor's wife Jenna Dewan-Tatum is currently pregnant with the couple's first child and he has turned to his G.I. Joe: The Rise of Cobra co-star Sienna for tips on what to expect.

"It's an on-going phone conversation, he's actually in London so I've been helping him out a lot. We've got the same obstetrician, same everything," Sienna said.

Channing and Jenna are living in London while he films Jupiter Ascending and Sienna is in New York with her fiance Tom Sturridge and their daughter Marlowe but she is "more than happy to be on-call" for the pair.

Jenna, 32, recently revealed Channing has been looking after her during the pregnancy and has been tending to her every need:

"I thought my body was going to change so quickly with pregnancy that I'd freak out. But it was really gradual. There's a reason women are pregnant for nine months; by the end, you're ready to have this baby. Channing has been great. He takes the route of no confrontation, just support, saying things like, 'Do whatever you want! What do you want to eat? I'm going to leave it up to you.'"