Justin's new track "What Do You Mean?" drops in 22 days. To hype it up, he's gotten all of his famous pals to help him countdown to the track's big premiere.
Kylie Jenner was the latest one to pitch in. She posted a promo for him on her Instagram account, too, and even sparked some Selena Gomez drama with all that.
It's clear that Ari and the Biebs are buddies. He was one of the first ones to stick up for her when that whole doughnut incident went down a few weeks ago. They also had their moment when they were cuddled up on stage shortly before her big split with Big Sean.
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Gallery | Justin Bieber's Famous BFFs