The Extreme Makeover: Weight Loss Edition host/trainer and wife Heidi welcomed a son early Monday morning in Arizona, his rep tells PEOPLE exclusively.

By peoplestaff225
Updated June 13, 2011 11:30 AM
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Let the challenges begin: Chris Powell is a new dad!

The Extreme Makeover: Weight Loss Edition trainer and wife Heidi welcomed a son early Monday morning, June 13 in Arizona, his rep tells PEOPLE exclusively.

William Cash Powell arrived at 2:14 a.m., weighing 7 lbs., 13 oz. and measuring 21.5 inches long. He joins big sister Marley, 4, and brother Matix, 6, from Heidi’s previous marriage.

“The little guy can already bench press 46 lbs.!” Powell jokes.

Mom and baby — who will go by his middle name — are settling in and resting comfortably, according to a statement from his rep.

Extreme Makeover: Weight Loss Edition airs Monday (10 p.m. ET) on ABC.

— Anya Leon with reporting by Monica Rizzo