The stars took to Twitter.com in their droves to post thoughts about and notes addressed to the television king behind American Bandstand, the American Music Awards and Dick Clark's New Year's Rockin' Eve shows.
McCarthy, who has co-hosted his televised New York New Year's celebration in recent years wrote, "RIP dick Clark. You were amazing to work with. U will be missed," while country singer and TV star Cyrus offered "Thoughts and prayers" to Clark's family.
Actresses Richards and Gabrielle Union, also paid tweet tributes, with Union posting, "NOOO! #RIPDickClark," while Richards added, "My heart goes out to Dick Clark's family and loved ones.... we lost a legend."
Meanwhile Josh Groban, Olivia Munn, David Boreanaz and newlywed Ricki Lake offered up simple "RIP Dick Clark" notes and Oscar winner Marlee Matlin added, "So sorry about passing of Dick Clark. A man with the gift of discovering talented musicians he also was a consummate producer/lovely man RIP."
TV and film favourites Seth Green and Melissa Joan Hart also offered their thoughts with the Robot Chicken star writing, "So saddened by Dick Clark's passing - an innovator, a legend, a man who believed in the greatness of humans. #ThankYou". Hart thanked the late legend for "entertaining my family for decades!" and added, "New Years won't be the same ever again!"
Clark, who was 82, died in a Los Angeles Hospital.