We think we see a tiny baby bump!

Gwen Stefani covered up in an embroidered maxi dress as she took her sons to church on Sunday, but we couldn't help but notice that the singer's rock hard abs didn't seem quite so rock hard underneath her outfit. Could she be expecting a baby with Blake Shelton?

Rumors have been swirling for a while now that the No Doubt songstress and the country crooner want to have a child together, and she's not getting any younger.

A source tells X17:
    "Gwen and Blake have been trying to get pregnant ever since they began dating. She's very religious and leaving it all up to God. Given her age, they've never used birth control and just figure if it happens it happens. She really wants Blake to have the experience of being a dad, and even though he's a father figure to her boys, she wants him to have one of his own."

She takes such good care of herself, we wouldn't be surprised if she had a bun in the oven at age 47!