TMZ has learned Robin Williams underwent his highly publicized heart surgery and is recovering at the Cleveland Clinic in Ohio.
Robin postponed his comedy tour at the beginning of this month after announcing he needed to have an aortic valve replacement.
UPDATE: Robin's rep just released this statement from his cardiothoracic surgeon:
"Mr. Williams' operation went extremely well and we expect him to make a full recovery. The 3 1/2 hour heart surgery was conducted to replace his aortic valve, repair his mitral valve, and correct his irregular heart beat.
His heart is strong and he will have a normal heart function in the coming weeks with no limitations on what he'll be able to do.
A couple of hours after surgery, he was entertaining the medical team and making us laugh."