The two girls were spotted posing for pictures with the rap star at the launch of his flagship Last Kings store in Los Angeles and oozed effortless style in their tomboy inspired ensembles.
Making a real impression on the day, Kylie donned a rather rude leather jacket, which was branded with the words 'F*ck Off' on the back.
But as opposed to being a subliminal message for the cameras, it was apparently just a way of supporting one of her new favourite artists.
Writing about her striking jacket on Instagram, Kylie said: "@jwoodzyx outdid himself! He made my favourite leather jacket come to life. I'm obsessed. Everyone follow my favourite artist."
The 16-year-old also wore a pair of striped trousers and some black boots, while older sister Kendall decided to support the Last Kings brand instead by wearing a red varsity jacket from the latest collection.
She completed her laid-back look with some boyfriend jeans and a cropped black top - a stark contrast to how she had been dressing earlier in the week.
Model Kendall hit the UK recently for London Fashion Week and as well as schmoozing in her glad rags on the FROW, she also took to the runway in the Giles Deacon show.
But now she is back home in LA and no doubt enjoying the warmer weather with her Kardashian-Jenner family and her pet dogs.
Yesterday's Last Kings launch was a showbiz affair with rappers Wiz Khalifa and Lil Twist - who is close pals with Kendall and Kylie - coming out to show their support too.
Also at the store was Tyga's girlfriend Black Chyna, who has become BFFs with Kim Kardashian over the last year.
However, her curvaceous bestie wasn't present, as she is currently accompanying fiancé Kanye West on his Yeezus tour on the East Coast and filming with her sister Khloe and Kourtney.
Mum-of-one Kim was pictured out and about in New York yesterday with her baby daughter North and indulging in some retail therapy.
Being the shopaholic that she is though, we're sure Kim will pay a trip to the Last Kings flagship store soon.
What do you think of Kylie and Kendall's cool style? Let us know below, as the best comment from across the website each week wins £50!
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