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As Hollywood and the world mourn the death of Whitney Houston, celebs like Mariah Carey and Christina Aguilera are expressing their sorrow online.

Houston, 48, died in a hotel room at the Beverly Hilton -- the cause of death not yet revealed.

Here's how the stars reacted to the news:

"We have lost another legend. Love and prayers to Whitney's family. She will be missed." - Christina Aguilera

"She will never be forgotten as one of the greatest voices to ever grace the earth." - Mariah Carey

"So devastating. We will always love you Whitney, R.I.P." - Katy Perry

"No words! Just tears #DearWhitney" - Rihanna

"I am devastated. I am absolutely devastated at the news about Whitney Houston. Such a tragic, tragic loss." - Paula Abdul

"I found my voice singing Whitney Houston's music. Today I lost my idol." - Jessica Simpson

"Just heard the tragic news that Whitney Houston passed away. I pray for her daughter & loved ones. We will always love you Whitney." - Kim Kardashian

"just heard the news. so crazy. One of the GREATEST VOICES EVER just passed. RIP Whitney Houston. My prayers go out to her friends and family." - Justin Bieber

"She's paved the way for every single singer in the music industry. Iconic, legendary, innovating, amazing, humble...1 the best in the world" - LA Reid

"RIP Whitney" - Adam Lambert

"R.I.P. Whitney Houston, really can't believe this" - Russell Simmons

"So so sad that Whitney Houston died...praying for her daughter and her family...tragic..just heartbreaking..amazing talent, amazing voice.." - Kris Jenner