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Kourtney Kardashian, Instagram


Kourtney Kardashian has officially jumped on board the waist-training phenomenon just like her sisters Khloé and Kim Kardashian!

The mother of three, who just recently gave birth on Dec. 14, shared a pre-workout selfie from her glamorous closet and showed off her hot pink new accessory.

"Starting my Monday with a little waist training before I go to the gym! #onamission #waistgangsociety," she wrote as the caption to the candid pic.

Late last month, the eldest Kardashian sister posted a similar shot with a different waist trainer and wrote, "Gettin' it right, gettin' it tight!"

And since giving birth to Reign Aston Disick—on the same day as little Mason Disick's birthday, ironically!—Kourtney's been keeping a relatively low profile.

Between just a handful of local dinner dates with Scott Disick and her sisters, and a sighting here and there out and about in Los Angeles, the brunette beauty has been understandably focused on all things family at the start of 2015.

Just a few days ago, Khloé turned heads after showing off the results of her intensive waist training regimen.

"I am obsessed with my new waist shaper from@premadonna87!!! I mean how cute is this shaper?!?!" Khloé captioned a pic of herself in her closet and wearing said shaper—clearly a Kardashian trend!

She added, "Snatching my waist and looking cute all at the same time!!! I definitely feel like a superhero in this waist shaper! Head over to @pre_shop or @premadonna87to get your shapers ladies! #Boom #Boom #Pow#WaistGang #PreMadonna87 #Snatched."

New episodes of Keeping Up With the Kardashians premiere March 15 on E!