Lady Gaga Forced to Cancel Tour, Get Hip Surgery

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FILE - In this Monday, Oct. 1, 2012 file photo, Lady Gaga arrives at the Versace atelier in Milan, Italy. Lady Gaga is taking her Born This Way Foundation on the road. The singer announced Thursday, Dec. 20, 2012, that the Born Brave Bus Tour will tailgate outside her upcoming U.S. concerts and provide a space for 13- to 25-year-olds to learn more about local resources on anti-bullying, suicide prevention and mental health services. Her foundation focuses on youth empowerment and self-confidence. (AP Photo/Luca Bruno) Photo: JRAA/ZDS/WENN.com

Lady Gaga was forced to postpone four U.S. concerts earlier this week. Now a "labral tear of the right hip" has the 26-year-old canceling the remainder of her Born This Way Ball tour, set to continue through mid-March. Gaga will require surgery followed by "strict downtime." After the initial batch of postponed dates, Gaga wrote, "I've been hiding this injury and pain from my staff for a month, praying it would heal, but after last night's performance I could not work." Ticket holders will be refunded.