Hayes Grier Does the Chubby Bunny Challenge (VIDEO)

If you don't know who Hayes Grier is, you will now.

The Vine Chart climbing, Twitter championing, rising star that is Hayes Grier showed his competitive side, though it's more adorable than ferocious. The thirteen-year-old North Carolinian social media personality has collected over 2 million Vine and Twitter followers and has toured the United States meeting his fans with his older brother, another social media titan Nash Grier, 16.

Nash has a Twitter following of over 2 million and over 3 million You-tube subscribers.

You can get a glimpse into the brothers' world in their Sibling Tag You-tube video, where the two opened up to fans about their lives and memories.

The latest news for the brothers Grier is their trending video under #HayesVideo, Chubby Bunny Challenge. In the video, the two, along with their younger sister Skylynn and friend Cameron, goof around in a contest to see who can stuff the most marshmallows in their mouths.  

The contest seems simple enough: Each challenger places one marshmallow at a time in their mouth and then says the phrase "chubby bunny."  This continues a few rounds until players are eliminated.  The winner is crowned if he or she can say the phrase "Chubby Bunny" with all of their marshmallows still in their mouth.

Those familiar with MTV's Awkward might know a thing or two about this challenge already.

Want to know what all the hype is about? Check out the video below.

Are you going to become a Grier brother follower? Let us know in the comments below!