LONDON (AP) — Madonna kicked off her career-spanning Celebration Tour at London's O2 Arena on Saturday night, marking her first performance since suffering what her manager called a “serious bacterial infection” that led to hospitalization in an intensive care unit for several days back in June. “I’m on the road to recovery and incredibly grateful for all the blessings in my life,” the pop superstar wrote on Instagram this summer, shortly after news of the ICU stay broke. “My focus now is on my health and getting stronger and I assure you, I’ll be back with you as soon as I can.” On stage, Madonna, 65, said she'd had a “crazy year" that neither she nor her doctors thought she'd make it through.