Michael Jackson was forced to undergo emergency surgery after his lip burst and collapsed, according to reports.He was photographed trying to conceal his bandaged and plastered face while on a shopping trip in Las Vegas, but now the reason has been confirmed.

His five-year-old son accidentally smacked him in the face, causing the problems with his upper lip, it has been revealed.A source said: “He was whacked in the face accidentally by his younger son Prince Michael II while playing around and part of Jackson’s upper lip collapsed.

“That mishap led an hysterical Jacko to make a beeline for the plastic surgeon for a bit of quickie repair work.”

source