Rob Kardashian calls out his haters: 'Yes, I'm fat now'

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Rob Kardashian calls out his haters: 'Yes, I'm fat now'
LAS VEGAS, NV - MAY 25: Television personality Rob Kardashian arrives at 1 OAK Nightclub at The Mirage Hotel & Casino for a Memorial Day weekend celebration on May 25, 2013 in Las Vegas, Nevada. (Photo by Steven Lawton/WireImage)
LOS ANGELES, CA - APRIL 01: Rob Kardashian is seen on April 01, 2013 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
LAS VEGAS, NV - JUNE 3: Rob Kardashian arrives at the 2012 Miss USA pageant the Planet Hollywood Resort & Casino on June 3, 2012 in Las Vegas, Nevada. (Photo by Isaac Brekken/Getty Images)
LAS VEGAS, NV - MAY 25: Rob Kardashian poses for photos with fans during his new Arthur George by Rob Kardashian sock collection unveiling at Neiman Marcus on May 25, 2013 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LAS VEGAS, NV - MARCH 16: Rob Kardashian and Kris Jenner during Rob Kardashian's Arthur George Street sock line launch at Kardashian Khaos at The Mirage Hotel & Casino on March 16, 2013 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LAS VEGAS, NV - MARCH 15: Rob Kardashian and Kris Jenner arrive at Rob Kardashian's 26th birthday celebration at 1 OAK Nightclub at The Mirage Hotel & Casino on March 15, 2013 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
MIAMI BEACH, FL - DECEMBER 10: Rob Kardashian presents his Arthur George Socks Collection at Neiman Marcus Bal Harbour at Neiman Marcus on December 10, 2012 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images)
MIAMI BEACH, FL - DECEMBER 10: Rob Kardashian presents his Arthur George Socks Collection at Neiman Marcus Bal Harbour at Neiman Marcus on December 10, 2012 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images)
NEW YORK, NY - APRIL 30: Rob Kardashian and Khloe Kardashian Odom of 'Keeping Up With The Kardashians' attend E! 2012 Upfront at NYC Gotham Hall on April 30, 2012 in New York City. (Photo by Dimitrios Kambouris/E/NBCU Photo Bank via Getty Images for E!)
LOS ANGELES, CA - MARCH 21: Rob Kardashian is seen on March 21, 2013 in Los Angeles, California. (Photo by JB Lacroix/WireImage)
LOS ANGELES, CA - APRIL 01: Rob Kardashian is seen on April 01, 2013 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
LOS ANGELES, CA - APRIL 01: Rob Kardashian is seen on April 01, 2013 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
LAS VEGAS, NV - MARCH 16: Television personality Rob Kardashian makes an appearance at the Kardashian Khaos store at the Mirage Hotel and Casino on March 16, 2013 in Las Vegas, Nevada. (Photo by Marcel Thomas/FilmMagic)
LAS VEGAS, NV - MARCH 15: (EXCLUSIVE COVERAGE) Rob Kardashian (R) celebrates his 26th birthday with his mom Kris Jenner (R) at 1 OAK Nightclub at The Mirage Hotel & Casino on March 15, 2013 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
MIAMI BEACH, FL - DECEMBER 10: Rob Kardashian and Neiman Marcus General Manager Frances Esquenazi present Arthur George Socks Collection at Neiman Marcus Bal Harbour at Neiman Marcus on December 10, 2012 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images)
ATLANTIC CITY, NJ - SEPTEMBER 29: Brody Jenner (L) and Rob Kardashian take pictures with fans while hosting The Pool After Dark at Harrah's Resort on Saturday September 29, 2012 in Atlantic City, New Jersey. (Photo by Tom Briglia/FilmMagic)
MANILA, PHILIPPINES - OCTOBER 27: Rob Kardashian and American socialite and model Kylie Jenner showcase designs by Human on the runway on day five of Philippine Fashion Week Spring/Summer 2013 on October 27, 2012 in Manila, Philippines. (Photo by Jeoffrey Maitem/Getty Images)
MANILA, PHILIPPINES - OCTOBER 27: Rob Kardashian and American socialite and model Kylie Jenner showcase designs by Human on the runway on day five of Philippine Fashion Week Spring/Summer 2013 on October 27, 2012 in Manila, Philippines. (Photo by Jeoffrey Maitem/Getty Images)
PARIS, FRANCE - SEPTEMBER 19: Rob Kardashian is seen strolling on September 19, 2012 in Paris, France. (Photo by Marc Piasecki/FilmMagic)
NEW YORK, NY - APRIL 30: (L-R) Rob Kardashian, Khloe Kardashian Odom and Lamar Odom of Keeping Up With The Kardashians attend 2012 E! Upfront at Gotham Hall on April 30, 2012 in New York City. (Photo by James Devaney/WireImage)
LAS VEGAS, NV - MARCH 16: (EXCLUSIVE COVERAGE) Kris Jenner, Rob Kardashian and Kim Kardashian celebrate Rob Kardashian's birthday at 1 Oak on March 16, 2012 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LAS VEGAS, NV - MARCH 16: Kris Jenner, Rob Kardashian and Kim Kardashian walk the red carpet at 1 Oak on March 16, 2012 in Las Vegas, Nevada. (Photo by Mindy Small/FilmMagic)
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Rob Kardashian addresses what we already knew. He's gained weight.

Using his haters as a motivator, the Keeping Up with the Kardashians star posted a few flashback photos to Instagram on Tuesday where he's showing off his fit physique. "Last throwback of the day and yes I'm fat now so y'all haters can literally suck d**k," one caption read.

PHOTOS: Shocking Celebrity Weight Loss Transformations

But that wasn't the last throwback pic posted. He later wrote: "Last throwback of the night before I go play some fat boy ball!! MOTIVATION."

This isn't the first time Rob has addressed his weight on social media. In May 2014, the 27-year-old reality star noticed on Twitter that he was trending "for being fat."

VIDEO: Kim Kardashian Finally Explains Why Rob Left Her Wedding

"And to the blogs saying I went to fat camp or rehab LOL then why am I still fat u foolsjQuery19104136640319460184_1423660677009 Y'all must have run out of real news," he tweeted. "First, I don't believe in rehab or therapy or anything of that sort and second I'm a grown man and will work on myself when I choose."

The rant continued: "I'm aware that I'm fat that def ain't a surprise to me lol and my only therapy will be in the gym anyways had to say somethingggggggggg."

Meanwhile, a number of other men have slimmed down in Hollywood, with The Hangover star Zach Galifianakis being the most notable. See their transformations, below.

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