The reality TV star hit the gym to work on her fitness Tuesday with celeb trainer Gunnar Peterson -- and the focus of this workout was definitely the derriere.
"Squat!!!!! Because no one ever wrote a song about a small ass right @gunnarfitness?" Khloe posted, along with a photo of her mid-squat ... her famous curves in full display (below). Gunnar also shared an equally booty-centric shot on his Instagram page, showing his trainee laid out on the ground after a workout (above).
The 30-year-old has been making frequent trips to the gym lately, after revealing she put on 10 pounds while filming her upcoming spinoff show in the Hamptons over the summer.
"Started working out again this week after slacking for a few months while taping in the Hamptons," she tweeted out earlier this month. "Mentally, I feel great already. My body will follow shortly. What r some of ur fav workouts?!? I love trying new things so I don't get bored."