Actress, Jessica Simpson poses for photographers while arriving for the T-Mobile Sidekick 3 launch party in Los Angeles, Tuesdaym June 20, 2006. (AP Photo/Lucas Jackson)

Actress Jessica Simpson, who is expecting her third child, feels amused by her older children's hilarious questions around the baby.

Six-year-old Maxwell and five-year-old Ace have asked if her "belly button is a speaker to communicate with the baby, reports

"They want to know every detail -- like how milk comes out of mommy, how the baby will actually get here...," Simpson said during a chat with People magazine.

Simpson announced the news of baby number three in an Instagram post last month that featured her two other children surrounded by a flurry of pink balloons, revealing that she's expecting a baby girl - she wrote: “This little baby girl will make us a family of five. We couldn’t be happier to announce this precious blessing of life.” Picture: Instagram.

The 38-year-old actress and fashion designer said she and husband Eric Johnson constantly wonder and try to figure out how to be honest to the kids.

Talking about how she deals with pregnancy cravings, Simpson said: "I crave everything! It's like, with a girl, I just want, like, Pop-Tarts and cinnamon rolls and cinnamon gummy bears and sour cherries."