The singer reportedly underwent heart surgery this past autumn.

The Daily Mail reports that Sir PAUL McCARTNEY underwent a secret heart surgery this past fall.

According to reports, the former BEATLE had a coronary angioplasty -- a procedure that helps unclog arteries -- after visiting a specialist in London.

A source tells the paper that Sir Paul bounced back quickly from the procedure, saying, "He has always been in exceptional health, which is remarkable when you think of the rock 'n' roll lifestyle he once had."

Just days ago, he helped ring in the New Year with KYLIE MINOGUE on JOOLS HOLLAND's New Year special on BBC2. The two performed his recent hit single "Dance Tonight".