Lou Reed's Death: Hollywood Mourns the Rock Icon

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Kirk Hammett, left, and Lou Reed at the 25th Anniversary Rock & Roll Hall of Fame concert in 2009

"He was a master," writes David Bowie, while John Cusack tweets that he was "inspired" by the singer-songwriter, who died Sunday at 71.

After news of Lou Reed's death broke early Sunday, many in Hollywood hit Twitter to mourn the rock icon.

Reed, who was 71, underwent a liver transplant operation at the Mayo Clinic in Cleveland in May. The singer-songwriter was best known for fronting the iconic 1960s group The Velvet Underground and later taking on unsavory subjects in a solo career.

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"He was a master," wrote old friend and fellow iconoclast David Bowie on his website.

Among the thousands more mourning Reed's loss were such luminaries as Kevin Smith, Jon Cryer, Olivia Wilde, John Cusack, Flea and Nikki Sixx. Read what they had to say below.