Lady Gaga announced via twitter that concerts in Chicago, Detroit and Ontario had to be postponed. Apparently Gaga couldn't walk after her performance Monday night and that's when her doctor advised her to cancel. The singer has been diagnosed with Synovitis, a severe inflammation of the joints. Mother Monster was devastated when she made the announcement, but it we know anything about Gaga, she will definitely make it up to her fans! Here's to a very speedy recovery, Lady Gaga!!