on Tuesday to share before and after pictures of her back.
The reality star showed proof of her amazing transformation over just a three-month period after she isolated her back muscles and built up her strength.
In the first photo, the TV personality wore a green strappy sports bra and matching leggings.
Her blonde hair was pulled into a bun as she flexed her back muscles, showing little to no definition.
Then, Khloe shared a follow-up photo of her current back, while wearing a black sports bra and matching leggings.
The new image showed a great deal of progress as the mother of one flexed her well-defined muscles for the camera.
The E! star captioned her post: "About 3 months apart. let’s go we are sculpting my back and arms."
DEALING WITH HEARTBREAK Despite Khloe's enthusiasm regarding her exercise routine, some fans have shown concern about her diet regimen, claiming she's become "too thin."
Last week, the Good American founder's followers shared their worry after her ribs were visible while she worked out at the gym.
Many believe the drastic weight loss came as a result of her "devastation" by the Tristan Thompson love child scandal.
The KUWTK alum took to her Instagram Stories to share two short clips while hard at work.
The first had the TV star on a stair climber while wearing Adidas workout pants and a pair of pink sneakers.
"Let's go," she wrote over the clip, adding "5:49 AM," as the time she was working up a sweat.
In the next Story, Khloe put her tiny waist on display as she offered up another angle while still on the step machine.
She wrote: "It's early but we are doing it."
In the snaps, Khloe posed in a tight bodysuit and showed off her blond curls as she called herself a "material girl."
However, some of her followers were quick to react to how "skinny" she is looking, as one wrote: "So thin!"
Another added: "So skinny!" while one chimed in, "Khloe, you're thinner than usual… What's happening to you sweetheart…?"
Others offered up a possible reason for Khloe's "thinness," as one said: "It's from Tristan's BS."
One fan agreed and added: "So sad..."
SHOCKING SCANDAL Tristan Thompson, 30, recently revealed he is now a father of three after fitness model Maralee welcomed their child.
Following a month of speculation, the NBA player revealed the paternity results and issued a public apology to Khloe.
The athlete wrote on social media: "Today, paternity test results revealed that I fathered a child with Maralee Nichols.
“I take full responsibility for my actions. Now that paternity has been established, I looked forward to amicably raising our son.
"I sincerely apologize to everyone I’ve hurt or disappointed throughout this ordeal both publicly and privately."
He then turned his attention directly to his ex and said: "Khloe. you don't deserve this. You don't deserve the heartache and humiliation I have caused you.
"You don't deserve the way I have treated you over the years. My actions have certainly not lined up with the way I view you.
"I have the utmost respect and love for you, regardless of what you may think."
He concluded: "Again I am so incredibly sorry."
Khloe is said to have been hit hard following Tristan's admission, as they were allegedly still in an exclusive relationship when the child was conceived.
Khloe has slimmed down substantially from her early days on TV Credit: Getty Tristan welcomed his third child late last year Credit: The Mega Agency
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