The actor masterminded last weekend's (03Sep11) Minot Rising concert, featuring his wife Fergie's band Black Eyed Peas, to raise cash for the community, after this summer's (11) floods washed houses away.
And during his trip back to Minot, Duhamel took an Entertainment Tonight camera crew back to the home he grew up in.
The place had been destroyed by flood water and his parents are rebuilding the inside of the property from scratch.
The actor toured the home with his sister and said, ""It's just heartbreaking.""
The Minot Rising concert raised more than $1 million (£625,000).