Proving that celebrities don't always look glamorous for a workout, Khloe donned a giant hooded sweatshirt on Saturday (3 August) that drowned her figure and hardly flattered her famous curves.
Given the hoody's incredible size, we wonder if the 29-year-old had borrowed it from her basketball player husband, Lamar Odom?
Khloe finished off her all-black gym ensemble with a pair of leggings, black Nike trainers and some cool shades. She also tied her long brown tresses up into a ponytail and treated herself to a smoothie.
The Kardashian sister has made no secret of the fact that she is committed to working out every week in a bid to stay in shape.
On Saturday she posted a picture of her mid-workout on a cross trainer and surprisingly, still wearing the oversized hoody! She captioned the snap: "When in doubt, sweat it out."
Well, she will certainly be sweating a lot in that outfit!
However, one thing she will not be seen wearing in the gym anytime soon is white spandex pants.
After one intense session, Khloe admitted that she had seen a little too much of one gym goer due to her choice of underwear.
The outspoken star tweeted: "Takes a lot of confidence 2wear white spandex workout pants in the gym. Some of this ladies positions r not good in any pants. #MorePower2Ya"
"For now I know to stick with my black spandex pants. Maybe one day ill upgrade to a colour LOL".
Have you ever worked out in a hoody? Let us know below, as the best comment each week wins £50!