Earlier today, "Dancing With The Stars" announced that Vine and YouTube star Hayes Grier would be competing on the upcoming season. While he's an Internet sensation and extremely popular across all social media platforms, those who aren't familiar with Vine may have never heard of the young star before. At just 15 years old, he's earned himself millions of followers on Vine, Instagram and Twitter, and he even has an equally famous Vine star brother, Nash Grier. The two have become pretty recognizable faces with their hilarious six-second videos, but there's still a lot you may not know about the young comic who's ready to take on the dance floor. Here are five things you need to know about Hayes Grier.

1. He gains about 100K followers a week on Vine

Hayes posted his first Vine on April 15, 2013, and things have only gone uphill from there considering he now has 4 million followers, according to Watt Pad. Back in October 2013, when he and his brother Nash used to post videos together through Nash's account, they were gaining 100,000 followers per week, according to The Charlotte Observer. His brother is now the second most followed Vine user on Rankzoo with more than 12 million followers, while Hayes comes in at number 34, right behind Justin Bieber.

2. He helped make his little sister a star

She may be one of the most adorable kids on social media, so once the Grier brothers started posting videos of their 6-year-old outgoing blonde little sister Skylynn, she became an instant favorite on Vine. Her Facebook page has more than 390K likes and she has 1.3 million followers on her own Vine.

3. He has a clothing line

Last year, he, Nash and their other Vine star BFF Cameron Dallas were hired by Aeropostale to design and model their own clothing line, according to Just Jared Jr. Their most recent photoshoot was for Aeropostale's United XXVI Summer Collection which consists of styles for young men and women with original artwork combined with textured fabrics. The designs were all hand-picked by the three boys and go for $20 max.

4. His other older brother is a college football star

Besides Nash and Skylynn, Hayes has another older brother, Will, who plays for the Florida Gators. He is currently in his second year of college at University of Florida and he was ranked the second best dual-threat quarterback in his class. He broke a ton of records during his high school days and was even once named the Parade Magazine Player of the Year.

5. A different Vine star made the Grier brothers famous

The two brothers from North Carolina posted a six-second video of them on a roof to Twitter when fellow Vine star Tiffany Semashko, who was already famous at the time, retweeted it, according to Chron. It eventually got 300,000 retweets, giving the Grier brothers their fame