Kylie Jenner models a triangle bra for Kim Kardashian's SKIMS collection

Kylie Jenner models a triangle bra for Kim Kardashian's SKIMS collection
Kylie Jenner models a triangle bra for  Kim Kardashian's SKIMS collection

Kylie Jenner has a billion dollar cosmetics empire that she looks after.

But the 23-year-old reality TV siren doesn't seem to mind helping out her sister Kim Kardashian, 40, once in a while. On Sunday the girlfriend of Travis Scott posed in a black Jersey triangle top from Kim's SKIMS collection to help promote the line.

This comes after the mom to Stormi Webster wore a bikini for sister Khloe Kardashian's Good American line.

Working for Kimmy: Kylie Jenner has a billion dollar cosmetics empire that she looks after . But the 23-year-old beauty doesn't seem to mind helping out her sister Kim Kardashian, 40, once in a while

Working for Kimmy: Kylie Jenner has a billion dollar cosmetics empire that she looks after . But the 23-year-old beauty doesn't seem to mind helping out her sister Kim Kardashian, 40, once in a while

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Jenner wore her black hair down in soft waves and had on light pink makeup as she posed for the camera in a studio setting with a sofa behind her.

The image appeared on Kylie's Instagram account as well as the SKIMS Instagram account. 

Kim noted that Kylie was wearing her Jersey cotton SKIMS bra while Kylie focused on the lip color she had on.

Skimming along: The image appeared on Kylie's Instagram account as well as the SKIMS Instagram account. Kim noted that Kylie was wearing her Jersey SKIMS bra while Kylie focused on the lip color she had on

Skimming along: The image appeared on Kylie's Instagram account as well as the SKIMS Instagram account. Kim noted that Kylie was wearing her Jersey SKIMS bra while Kylie focused on the lip color she had on

Last week Kylie slipped into a gold bikini tp help promote Khloe Kardashian's Good American bikini line. She looked in top shape as she wore her hair down and posed just so.

Kylie has also included family members such as Kim, Khloe, Kourtney, Kris and Kendall, in her beauty collections for Kylie Cosmetics. 

Last week, Kim was plugging SKIMS as well. She shared older photos from her nude SKIMS collection as she said they had restocked the line.  

For KOKO: Last week Kylie slipped into a gold bikini tp help promote Khloe Kardashian's Good American bikini line. She looked in top shape as she wore her hair down and posed just so

For KOKO: Last week Kylie slipped into a gold bikini tp help promote Khloe Kardashian's Good American bikini line. She looked in top shape as she wore her hair down and posed just so

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Kim wore the nude one piece suit from SKIMS well as it made the most of her tiny 5ft2in frame.

The looker has been working out with weights for the past two years and is in the best shape of her life, thanks in part to personal trainer Melissa Alcantara.

Her raven hair was worn straight and down as she modeled a fresh tan.

'@KimKardashian wears the (just replenished!) Sculpting Bodysuit in Sienna. This everyday shapewear essential holds in your core, lifts your backside, and supports your chest. Wear it on top or underneath in 9 shades and sizes XXS-5X,' it was shared on the SKIMS Instagram page.

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