Three 6 Mafia's DJ Paul and Juicy J shared tributes on social media.
The musician and "Girls5Eva" star appeared to announce her engagement to her longtime boyfriend on New Year's Day.
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"I don’t have a plan. That should’ve been clear from the jump," Cannon said during CNN's "New Year's Eve Live" special.
The musician had recently been diagnosed with cancer.
"She was the one that kept all of us close and together for so long," her family said in a statement.
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The superstar's new single "Flowers" will arrive on Jan. 13.
"We will miss her but always remember her with great fondness," McCartney wrote.
"He'll be there in spirit with all of us every night," the band wrote of their beloved late drummer.
