Has this tum really sprogged two children?
Yes - and it's only three months shy of its 40th birthday.
So who do these rock-hard abs belong to?
The stomach of steel is being paraded by Gwen Stefani on the latest No Doubt tour.
At the start of her career, Gwen was famed for her belly-baring costumes and it looks like she's managed to turn back time for her No Doubt revival.
There's no stopping the star as she bounces around on stage in America in a tiny crop top and red bra.
Check out Gwen's abs in action, along with some more stars who've been doing their stomach chrunches...
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