The Keeping Up with the Kardashians star got into a heated debate about the app
Credit: Source Snapchat

brightcove.createExperiences(); Is King Kylie about to get dethroned?

Kylie Jenner was the first member of her famous family to join Snapchat – and from her epic mini-movies, insane disguises and racy make-outs with boyfriend Tyga, she has long been known as the reigning queen of the app – but now Kourtney Kardashian is giving her a run for her money.

Kardashian made a public account on the app a week ago and so far, her snaps haven’t disappointed – in fact, she’s calling herself the “new Snapchat queen.”

On Wednesday night, the two sisters (and the rest of their famous family/crew) hit up the Justin Bieber concert in Los Angeles, and Jenner, 18, and Kardashian, 36, went Snap-to-Snap in a heated debate of who’s more popular on the app.

“I’m going to f—ing kill you if you take my Snapchat crown,” Jenner jokingly whispered in Kardashian’s ear at one point.

“I already took it!” countered Kardashian.

Jenner continued to document the rest of their evening, joking around with Kim Kardashian West and Kanye West.

RELATED VIDEO: Kylie Jenner’s Snapchat Slip-up

Either way, we’re happy to sit back and watch them battle it out for the crown – and may the best Snapper win.