The country star performs "Achy Breaky Heart" live and shares his thoughts about Miley & Noah's success.
Castmates including KJ Apa, Cole Sprouse, Lili Reinhart, & more play "Riverdale Rapid Fire".
Chester Bennington, Mike Shinoda, and Brad Delson discuss their most emotional songs.
Olympic gymnast and pro partner Sasha Farber rehearse their next "Dancing with the Stars" routine.
YOUNG HOLLYWOOD TV
The only other stars who can lay claim to the honour are Lady Gaga and Justin Bieber - the teenager remains the all-time most-viewed artist on YouTube.com with 1.3 billion views, according to FameCount.com.