Former 'Ace of Cakes' star Duff Goldman shows off dramatic weight loss

Duff Goldman is lookin' good!

The former "Ace of Cakes" star took to Instagram to flaunt his noticeably slimmer figure just three months into his weight loss journey.

"Wow. It's been three months and I feel like these are photos of two different people," the 42-year-old star wrote alongside a side-by-side comparison of his former self and what he looks like now.

Goldman told commenters that he dropped the weight the "old school" way by "eating clean, riding my bike, lifting weights." Throughout his weight loss journey, the Food Network star has also kept his fans updated on Instagram, often posting photos of himself and his workout sessions.

Just a week ago, he shared a mirror selfie calling out one problem he's encountered -- not fitting into any of his old clothes anymore!

"That feeling when you lose so much weight you drop a shirt size so all your friends send you new t-shirts," Goldman wrote alongside a photo of himself.

The celebrity chef joins a number of other stars who have been working on their fitness this summer. Recently, "Wolf of Wall Street" star Jonah Hill stepped out looking especially fit. Check out the slideshow below for more impressive celeb weight loss transformations.