Valentine's Day is basically here! The Kar-Jenner clan loves a holiday (especially when it helps them sell merch) so nobody should be surprised that this V-Day involves a major advertising campaign for Kim Kardashian's 'Skims' line.

To celebrate Kim's new range of ultra-romantic underwear, Kylie posted some shots of herself with a lollipop and Kendall almost broke the internet showing off a Skims thong in pics including a mirror selfie. Here's what happened behind the scenes.

Ariana Grande Set the Mood

In Kylie's Stories, she tagged the official Skims IG account over grainy footage of herself posing with Kim and Kendall in matching red lingerie. The pink monochrome set is full of one person's voice: Ariana Grande's. The women strike poses to 'Greedy' and 'I'm So Into You,' two tracks in Ari's repetoire that ooze sultry vibes.

Fans who thought Kylie might be working on baby number two now have some picture proof that, at least when these pics were taken, this mama wasn't hiding anything.

RELATED: Kylie Jenner's Birthday Post To Stormi Is One Of Her Best Mommy Moments Yet

They Ate Cake

At one point, the shoot was LITERALLY sweet. Kylie shared pics of her using a big white heart-shaped cake with SKIMS on it as a prop, and Kendall had her own mini version to pose with (and hopefully snack on).

Kylie's Stories featured one shot of her seductively pouting with frosting on her hand (lol) while Kendall went the playful route, poking her pink-frosting finger at the camera. Then she showed off her festive photoshoot manicure.

NEXT: Here's How The Kardashian-Jenner Sisters Stay In Shape