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The 24-year-old pop star had been confirmed to appear onstage to accept the show's highest honor, the Ultimate Choice Award, for her involvement in the annual event for over a decade. Cyrus was also nominated in four categories: Choice Female Artist, Choice Song: Female Artist ("Malibu"), Choice Summer Female Artist, Choice Summer Song ("Malibu") and Choice Summer Female Artist. But the singer, who has a remarkable 18 wins under her belt, lost all four awards.
Cyrus' absence was felt throughout UCLA's Galen Center.
"I know," presenter Victoria Justice told the audience. "It's a bummer."
So, why did Cyrus cancel at the last minute?