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Feb 4, 2014 | This won't be good for their new albums!!!! @KhloeKardashian @KylieJenner by KimKardashian on Keek.com

Sometimes Khloe Kardashian and Kylie Jenner make sweet music together. Or at least, they yell at the top of their lungs to whatever's playing on the radio.

And sometimes, Kim Kardashian is there to record the entire thing for her Keek followers. Thanks, Kim!

This time, Khloé and Kylie belted "Mirrors" by the one and only Justin Timberlake. And surprisingly, the pair didn't really know the lyrics. It's all good, that's when humming comes into play.

Kim hints that this is a top secret, hidden camera recording by opening up the video shushing viewers. Technically, we catch about 10 seconds of genuine sing-along before Kylie realizes what's going on, but she continues, as does Khloé, who was too busy behind the wheel to really notice what was happening.

Khloe Kardashian, Kylie Jenner, Instagram


We're guessing this wasn't the car trip to the hospital yesterday to tend to Kylie's injuries after getting a little too rough with her sister on the trampoline.

"in the hospital thanks to @khloekardashian," the 16-year-old wrote on Instagram. "(Look at her page for the reason why) my mom said 'never thought I would take u to the doctor for a trampoline accident at this age) this means war Khloe. Ps. It was painful taking this photo."

E! News learned that the young star went to a Los Angeles hospital yesterday afternoon. After getting checked out, she is OK, a source tells us, but did suffer a minor injury. "She bruised her sternum when she collided with Khloé on a trampoline," the source added.

We'd sing you back to health, Kylie, but we're sure Khloé's got that handled.

Don't miss a new episode of Keeping Up With the Kardashians this Sunday at 9 p.m., only on E!

PHOTOS: Keeping up with Kylie & Kendall on Instagram