Kendall Jenner and sister Kylie pose up in sexy minidresses during surprise Las Vegas appearance… after model insisted there’s no sibling rivalry over who is ‘prettier’

Kendall and Kylie Jenner showed off their figures in tight dresses during a surprise appearance at Marquee Las Vegas’ Summer Kickoff event.

Kylie showed off her curves in a figure-hugging red PVC dress, while Kendall opted for a strapless black mini dress.

On Instagram, the sisters — Kendall, 28, and Kylie, 26 — shared several outtakes from the soiree while promoting Kylie’s Sprinter drink and Kendall’s 818 Tequila.

The sisters – whose cousin Psalm turned five this week – posed for photos and videos at the festive occasion.

It comes after the supermodel insisted there has never been a sibling rivalry over ‘who is more beautiful’.

Kendall and Kylie Jenner show off their figures in tight dresses during a surprise appearance at Marquee Las Vegas’ Summer Kickoff event

Kylie showed off her curves in a figure-hugging red PVC dress, while Kendall opted for a strapless black mini dress

Kylie showed off her curves in a figure-hugging red PVC dress, while Kendall opted for a strapless black mini dress

On Instagram, the sisters – Kendall, 28, and Kylie, 26 – shared several outtakes from the soiree

On Instagram, the sisters – Kendall, 28, and Kylie, 26 – shared several outtakes from the soiree

The family members were picture-ready as they delighted unsuspecting fans who were partying by the pool and bar.

Kylie put on a busty show in her dress, which was low-cut and had thin spaghetti straps.

She complemented the sexy number with a pair of nude backless heels with perspex straps.

The mother of two’s bouncy, brunette locks were placed in the middle and had fluffy barrel curls.

And the makeup mogul’s face was beautifully made up, with blushing cheeks and a pout covered in a mauve lipstick with a darker liner.

For her part, Kendall wowed in a layered, straight-cut top and matching tiny skirt.

She underlined the simple and sophisticated outfit with black strappy heels.

The catwalk regular wore her dark hair down, also styled in a center parting as it flowed down her back.

Kylie shared an Instagram grid post with several photos from the event

Kylie shared an Instagram grid post with several photos from the event

To engage her 400 million followers, she wrote in the caption

To engage her 400 million followers, she wrote in the caption “sister work day @drinksprinter @drink818”

The sisters showed off their playful side in images from the pool party

The sisters showed off their playful side in images from the pool party

The older Jenner wore narrow black sunglasses on her head in the series of photos and video clips.

And the Kylie Cosmetics founder also wore some shimmery, onyx shades in some versions.

Kylie shared an Instagram grid post with several photos from the event.

To engage her 400 million followers, she wrote in the caption, “sister work day @drinksprinter @drink818.”

The bombshell uploaded several close-up photos with her big sister.

The official Marquee Instagram account shared images of the fun-filled day, writing in the caption, “Pool season is officially here with the summer kickoff of #MarqueeDayclub.”

It added that “@kendalljenner and @kyliejenner wowed the party and kept the vibe strong” with their drinks.

The sisters posed for photos and videos during the festive occasion

The sisters posed for photos and videos during the festive occasion

Kendall was spotted holding a bottle of her 818 Tequila while Kylie held a green can of her vodka mix

Kendall was spotted holding a bottle of her 818 Tequila while Kylie held a green can of her vodka mix

This week, Kendall opened up to Vogue about the dynamic between her and Kylie, whose parents are Kris Jenner and Caitlin (nee Bruce) Jenner.

“Even with my little sister, the biggest thing we fought about was the TV remote. There was never such a thing as who is better dressed and who is more beautiful. It was always: you are you, I am me,” she told the fashion magazine.

“I’ve never seen my career as a competition, and that’s thanks to great sisters. I really do it, and if you don’t like it, that’s okay. But I trust that being the most authentic version of myself will take me to the places it takes to get me,” she added.

Kendall and Kylie launched their careers as teenagers with Kendall + Kylie collaborations with PacSun, Topshop, Gillette, Steve Madden, Pascal Mouawad’s Glamhouse and Glu Mobile.