The 'I Will Always Love You' star was found dead in the bathtub of her Beverly Hills hotel last year, just hours before she was due to perform at Clive Davis's annual pre-Grammys party.
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Ray J: "1 year ago I lost my heart. I would give anything just to see you smile again. I love u so much and I miss you even more today."
Brandy: "She was the greatest voice of all time and nobody will ever come close to touching her. I will never forget her."
Mariah Carey:: "It's 2/11..remembering my friend the incredible Whitney Houston. It's been a year & still so hard to believe. Her legend lives on eternally."
Lady GaGa: "A year since Whitney. Marilyn, Judy, Sylvia: tell em' how you feel girls. otherwise no one will."
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LA Reid: "I can't sing, but I used to sing with Whitney, just for fun. Just that beautiful spirit and warm personality and that amazing voice."
Alexandra Burke: "1 year today we lost you.. RIP Whitney. You are missed... [I] had to go and see The Bodyguard tonight... Such a tribute to Whitney and keeping her legacy alive. Her music will forever live on."
Toni Braxton: RIP to the late GREAT Nippy! The one and only Whitney Houston! You will FOREVER be loved and missed! Xoxoxo
Dave Grohl described her as "one of the most iconic vocalists of all time", adding: "Not only did she sell 800 bazillion records but she's [an] amazing singer."
Keisha Buchanan: "RIP Whitney xXx #Thebestthateverdidit."
Photo gallery - Whitney Houston's life in pictures:
Rising star Whitney Houston is seen with music producer Clive Davis, in 1983, shortly after signing a contract with Arista Records.
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