Kim Kardashian takes candid video of her sisters Kylie and Khloe singing ...

By Daily Mail Reporter

PUBLISHED: 20:29 EST, 4 February 2014 | UPDATED: 21:41 EST, 4 February 2014

She's been busy tending to her newborn baby North and planning her future nuptials with Kanye West.

But Kim Kardashian still manages to find time to embarrass her younger sisters.

During a car ride on Tuesday, the 33-year-old socialite candidly captured her sisters Kylie, 16, and Khloe, 29, singing along to Justin Timberlake's hit Mirrors.

In an attempt to be sneaky, the Keeping Up With The Kardashians star - who was sitting in the passenger side - subtly placed her cell phone over her left shoulder to film Kylie singing in the back seat.

Hinting at her slyness, Kim placed a finger over her mouth, shushing the camera.

Khloe happened to catch on from the driver's seat and further provoked the teen model by saying, 'Sing it, Kyles.'

But Khloe couldn't resist not humming along to the pop tune.

Making it a game, she chanted, 'How bad can you sing?'

Meanwhile, Kylie didn't seem to have any clue as to what was going on.

Instead, she appeared to be taking selfies whilst fixing her hair.

'This won't be good for their new albums!!!! @KhloeKardashian @KylieJenner,' Kim joked with the video she later posted on Keek.

Following the trio's car ride, they let loose on a trampoline.

Even Kim was seen jumping around in her pencil skirt.

'This started out calm and ended in a war! Sorry @kyliejenner,' Khloe posted to Instagram with a picture of the their outdoor activities.

But it didn't end so well for Kylie, who was rushed to hospital.

'In the hospital thanks to @khloekardashian,' the reality TV star tweeted with a picture of her concealing her injured nose.

'Look at her page for the reason why (sic) 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.'