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LOS ANGELES (AP) - Miley Cyrus is in the hospital and unable to perform her "Bangerz" concert in Kansas City, Mo., as planned.

A spokeswoman for the singer says the 21-year-old canceled her performance Tuesday after she was hospitalized for a severe allergic reaction to antibiotics.

Publicist Meghan Prophet says in a statement that Cyrus is on "medical rest" at her doctors' advice.

Cyrus said on Twitter that she's heartbroken to miss the show. She also posted a photo of herself wearing what appears to be a hospital gown.

Tickets for the concert at Sprint Center are being refunded.

Cyrus is scheduled to perform Wednesday night in St. Louis.

(Copyright 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)

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