Lady Gaga postponing shows

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Lady Gaga says she's "heartsick" to postpone four shows. But an injury has left her unable to walk. The first of those shows are tonight and tomorrow in Chicago, and then this weekend in Detroit and Hamilton, Ontario.

Lady Gaga says she has a severe joint inflammation that left her immobile after Monday's concert in Montreal. She says she's been hiding her condition for sometime now and didn't even tell her staff.

Lady Gaga tweeted she's been praying it would heal. Makeup dates for the missed shows will be announced later.

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