Adam Yauch, left, with Mike Diamond and Adam Horovitz. Credit: Chris Polk/FilmMagic

Celebrity reaction to Beastie Boy Adam Yauch's sudden death swept the Internet today. On Twitter, tributes from the music world and beyond abound:

"Adam was incredibly sweet and the most sensitive artist who I loved dearly. I was always inspired by his work. He will be missed by all of us." - Russell Simmons, mentor for the Beastie Boys and founder of GlobalGrind.com.

"Crushed to hear the news of Adam Yauch's passing. A true pioneer of art. My thoughts and prayers are with his family and loved ones. #RIPMCA" -  Justin Timberlake.

"God Bless the soul of Adam Yauch aka MCA of the Beastie Boys. RIP" -  Common.

"What an awful day. Rest in peace, MCA." -  Martha Plimpton.

"Rest in Peace Adam Yauch. Our condolences to your friends and family." - Duran Duran.

"Rest in peace MCA. You are a legend. No sleep 'till Brooklyn. Lenny." - Lenny Kravitz.

"Crushed to hear the news of Adam Yauch's passing.  #RIPMCA" - Lance Armstrong.

"We lost one of our greatest talents today. my prayers and thoughts go out to the family and friends of Adam Yauch. Beastie Boys for life." - Milla Jovovich.