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.

Wow. It's been three months and I feel like these are photos of two different people.

A post shared by Duff Goldman (@duffgoldman) on

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.

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Duff Goldman out and about
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Duff Goldman out and about
THE CHEW - Tim McGraw and Duff Goldman help celebrate Fat Tuesday, February 28, 2017 on ABC's 'The Chew.' 'The Chew' airs MONDAY - FRIDAY (1-2pm, ET) on the ABC Television Network. (Photo by Paula Lobo/ABC via Getty Images) CLINTON KELLY, CARLA HALL, TIM MCGRAW, MICHAEL SYMON, DAPHNE OZ
THE CHEW - Tim McGraw and Duff Goldman help celebrate Fat Tuesday, February 28, 2017 on ABC's 'The Chew.' 'The Chew' airs MONDAY - FRIDAY (1-2pm, ET) on the ABC Television Network. (Photo by Paula Lobo/ABC via Getty Images) DUFF GOLDMAN, MICHAEL SYMON
CULVER CITY, CA - NOVEMBER 13: Chef Duff Goldman arrives at the 3rd Annual Save A Child's Heart Gala at Sony Studios Commissary on November 13, 2016 in Culver City, California. (Photo by Rodin Eckenroth/Getty Images,)
LOS ANGELES, CALIFORNIA - APRIL 09: Pastry chef Duff Goldman attends the 2016 Los Angeles Times Festival of Books at USC on April 9, 2016 in Los Angeles, California. (Photo by David Livingston/Getty Images)
NEW YORK, NEW YORK - APRIL 07: Duff Goldman visits the AOL Build Speakers Seriesto discuss 'Cake Masters' at AOL Studios In New York on April 7, 2016 in New York City. (Photo by Esther Horvath/FilmMagic)
MIAMI BEACH, FL - FEBRUARY 27: Pastry chef Duff Goldman attends the Sweet 15: A Dessert Party Hosted By Duff Goldman during 2016 Food Network & Cooking Channel South Beach Wine & Food Festival Presented By FOOD & WINE at The Villa, Casa Casaurina on February 27, 2016 in Miami Beach, Florida. (Photo by John Parra/Getty Images for SOBEWFF�)
MIAMI BEACH, FL - FEBRUARY 27: Pastry chef Duff Goldman leads a culinary demonstration at Goya Foods Grand Tasting Village Featuring MasterCard Grand Tasting Tents & KitchenAid� Culinary Demonstrations 2016 Food Network & Cooking Channel South Beach Wine & Food Festival Presented By FOOD & WINE at Grand Tasting Village on February 27, 2016 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images)
NEW YORK, NY - OCTOBER 17: Chef Duff Goldman of Charm City Cakes attends Jets + Chefs: The Ultimate Tailgate hosted by Joe Namath and Mario Batali - Food Network & Cooking Channel New York City Wine & Food Festival presented by FOOD & WINE at Pier 92 on October 17, 2015 in New York City. (Photo by Robin Marchant/Getty Images for NYCWFF)
NEW YORK, NY - OCTOBER 18: Pastry chef Duff Goldman participates at the Grand Tasting presented by ShopRite featuring Samsung Culinary Demonstrations presented by MasterCard� - Food Network & Cooking Channel New York City Wine & Food Festival presented by FOOD & WINE at Pier 94 on October 18, 2015 in New York City. (Photo by Michael Loccisano/Getty Images for NYCWFF)
ANAHEIM, CA - JANUARY 16: Chef and TV personality Duff Goldman arrive at the Monster Jam at Angel Stadium of Anaheim on January 16, 2016 in Anaheim, California. (Photo by Jerod Harris/Getty Images)
SANTA MONICA, CA - JUNE 16: Duff Goldman attends 826LA's 10th Anniversary Gala at Santa Monica Bay Woman's Club on June 16, 2015 in Santa Monica, California. (Photo by Jason Kempin/Getty Images)
FOOD FIGHTERS -- '206' Episode 206 -- Pictured: Duff Goldman -- (Photo by: Greg Gayne/NBC/NBCU Photo Bank via Getty Images)
MIAMI, FL - FEBRUARY 21: Chef Duff Goldman prepares food at Fun and Fit as a Family sponsored by Carnival featuring Goya Kidz Kitchen during the 2015 Food Network & Cooking Channel South Beach Wine & Food Festival presented by FOOD & WINE at Jungle Island on February 21, 2015 in Miami, Florida. (Photo by John Parra/Getty Images For SOBEWFF)
PHOENIX, AZ - JANUARY 31: TV personality Duff Goldman attends DIRECTV Super Saturday Night - Arrivals at DIRECTV SuperFan Stadium on January 31, 2015 in Phoenix, Arizona. (Photo by Vivien Killilea/WireImage)
WASHINGTON, DC - NOVEMBER 11: (L-R) Christina Tosi, Duff Goldman, Ally Guleria and Ted Allen pose for a photo together during the DC Central Kitchen's Capital Food Fight event at Ronald Reagan Building on November 11, 2014 in Washington, DC. (Photo by Larry French/Getty Images for DC Central Kitchen)
GLENDALE, AZ - JANUARY 31: TV personality Duff Goldman attends DirecTV Super Saturday Night hosted by Mark Cuban's AXS TV and Pro Football Hall of Famer Michael Strahan at Pendergast Family Farm on January 31, 2015 in Glendale, Arizona. (Photo by Ethan Miller/Getty Images for DirecTV)
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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.

21 PHOTOS
Shocking celebrity weight-loss transformations
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Shocking celebrity weight-loss transformations

Khloe Kardashian in 2012

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Khloe Kardashian in 2016

Hard work does pay off! The youngest Kardashian sister is obsessed with exercising and documents all her workout sessions on social media.

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Lena Dunham in 2015

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Lena Dunham in 2017

The "Girls" star lost a significant amount of weight after going on a holistic diet to help alleviate symptoms of endometriosis. 

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Mama June in 2013

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Mama June in 2017

The "Honey Boo Boo" star documented her weight loss journey on her very own reality show! She is now down to a size 4 -- and she looks incredible!

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Wendy Williams in 2012

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Wendy Williams in 2017

The TV personality revealed in 2015 that she lost 50 pounds over the course of three years with a healthy diet that doesn't include refined sugars, meat, dairy or "eating after dark." It looks like she's been committed to the strict diet. She looks better than ever in 2017!

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Ricki Lake in 2010

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Ricki Lake in 2011

The actress lost 20 pounds when she appeared on "Dancing With the Stars" in 2011.

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Jordin Sparks in 2008

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Jordin Sparks in 2017

Hard work pays off! "American Idol" alum began her weight loss journey by walking around her neighborhood and the rest was history! Her favorite workout? Zumba.

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Sara Rue in 2003

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Sara Rue in 2016

The "Rules of Engagement" star is a total fan of Jenny Craig for its simplicity. She looks incredible and totally glowing!

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Jonah Hill in 2014

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Jonah Hill in 2017

Talk about a transformation! Hill has lost weight and gained weight through the years -- depending on the movie he's working on -- but his latest transformation is absolutely jaw-dropping.

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Christina Aguilera in 2012

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Christina Aguilera in 2013

Smoke show! The songstress dropped 20 pounds over the course of one year. Doesn't she look incredible?!

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Miranda Lambert in 2012

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Miranda Lambert in 2013

The country crooner slammed critics who accused her of having weight loss surgery. She revealed that she dropped the pounds the old-fashioned way -- eating right and working out with her trainer!

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