Rod Stewart has canceled the remainder of his tour after undergoing heart surgery, following several months of health struggles for the 81-year-old star. The father of eight was forced to cancel all tour dates, with his team revealing that he underwent a successful coronary stent procedure and was putting his energy into recovery. © Instagram Rod underwent heart surgery and is recovering well"On the advice of his doctors, he will take the next four weeks to recuperate and regain full fitness before returning to the stage. A week later, Rod left fans concerned after he was seen using an oxygen tank onstage at his Utah show. © Instagram Levi is Rod's sixth grandchild"His name Levi means My Heart and his arrival has grown our hearts to 10 times the size."