Lady Gaga underwent hip surgery Wednesday, a week after she was forced to cancel the remainder of her "Born This Way" tour because of severe joint inflammation and torn cartilage.

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After the surgery, the singer thanked her fans for their support. "You really gave me a lot of strength today," she wrote late Wednesday on her website. "Everything happened so fast, but when it came time to face it I reflected on the many stories and experiences you've shared with me about your lives. Meeting you backstage, reading your letters, watching you communicate with fans from around the globe . . . As they wheeled me into surgery today, I thought about all of your pain and perseverance, your unique family situations, school environments, health issues, homelessness, identity struggles -- sometimes you are so brave that it terrifies me."

Before the operation she tweeted, "Going in for surgery now. Thank you so much for sending me love and support. I will be dreaming of you."