TV and radio personality Ryan Seacrest's YouTube channel reached 100 million views Thursday, and he's invited superstar Justin Bieber to help him celebrate.
 
Watch the pair as they attempt to make the most viral video ever, complete with puppies, dancing, and a Kathy Griffin cameo.



The 18-year-old heartthrob will co-host with the 102.7 host at the station's Wango Tango concert, held May 12 at the Home Depot Center in Los Angeles.

Seacrest's YouTube channel has 383 videos to date, featuring stars such as Lady Gaga, Kim Kardashian, Robert Pattinson, Rihanna and more.

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