'Teen Mom' Daddy -- Losing the Baby Weight

2/17/2011 3:40 PM PST BY Johnny Lopez
When not fighting with "Teen Mom" Amber Portwood, her baby daddy Gary Shirley is waging an all out battle of the bulge.

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With a trainer at his side, Big Daddy worked up a sweat at a gym in Indiana on Wednesday.

He's shaping up to be a good father.