Kourtney loosens up her buttons and it's all kinds of cringe-worthy.
In a preview clip from this Sunday's "Keeping Up with the Kardashians," Kourtney gets revenge on her sister for ruining her dance class "with her critiques" by surprising her in public with a group performance to The Pussycat Dolls' "Buttons."
After enlisting Khloe Kardashian's help to get Kim to an outdoor mall, Kourtney and her backup dancers started to do their thing in the middle of the promenade.
Kim reacted with shock, before exclaiming, "I'm literally going to cry ... what the f--k is going on?!"
Khloe even momentarily joined the fun, before quitting as she said, "I'm too pregnant to do this."
In a confessional, Kourt explained it was all part of her plan to embarrass her sister. "Did I succeed?" she asked. "You did," Kim responded.
"Keeping Up with the Kardashians" airs Sundays on E!