Hollywood turned to Twitter and other media outlets Saturday night to react to the passing of iconic pop star Whitney Houston, who was found dead Saturday afternoon just one day before the Grammy Awards.

Whitney Houston was one of the world’s greatest pop singers of all time who leaves behind a robust musical soundtrack spanning the past three decades,” said Recording Academy President/CEO Neil Portnow said in a statement. “Her powerful voice graced many memorable and award-winning songs. A light has been dimmed in our music community today, and we extend our deepest condolences to her family, friends, fans and all who have been touched by her beautiful voice.”

“Heartbroken and in tears over the shocking death of my friend, the incomparable Ms. Whitney Houston,” Mariah Carey tweeted.

“When I wrote Born This Way I imagined Whitney singing it because I wasn’t secure enough to be a star,” Lady Gaga said on Twitter.

“Deeply saddened by the death of Whitney Houston…may she rest in peace,” music mogul Russell Simmons wrote on Twitter.

Sony, distributor of upcoming Whitney Houston-starrer “Sparkle,” said through spokesman Steve Elzer: “Like all those who knew and loved her, we are shocked and saddened and the world has lost an incomparable talent. Right now our thoughts are with her daughter, her family and her friends.”

Meanwhile, Rihanna, scheduled to perform at tomorrow night’s Grammy Awards, tweeted: “Feels so strange being at the Grammy rehearsal right now!!”

“Such a loss. One of the greatest voices of our time. Sending out prayers to her family… #R.I.P.Whitney,” tweets Jennifer Lopez.

“The Voice” judge and recording artist Cee-Lo told Variety “What can I say that everyone doesn’t already know? She was an original and will always have my love and respect. She shined.”

Debra L. Lee, Chairman and CEO BET Networks, said in a statement: “We are all simply heartbroken by the sudden passing of Whitney Houston. She was among the greatest artists of our time. She was an icon, trailblazer, international phenomenon — an incomparable talent that will forever be missed. Our prayers and condolences go out to her daughter, mother and her entire family. We will always love her.”

“I’m speechless…I’m in shock right now. Just pray for her and the family,” Chaka Khan tweeted. Houston began her career as a back-up singer for Khan.