Wacko Jacko has reportedly become a father for the third time -- but nobody's saying who the mom is.

People magazine says Michael Jackson has been parading around a 6-month-old boy and telling pals, "This is my third child." 

He's introducing the tot as Prince Michael II. 

The new baby was unveiled at Siegfried and Roy's Las Vegas show on July 30, as Jacko brought him backstage along with his other kids, Prince Michael, 5, and Paris, 4. 

One close Jackson friend says the baby was not adopted, but conceived "the natural way." 

It's not known, though, who delivered Jacko's latest bundle of joy. Friends believe the mom could be his ex-wife Debbie Rowe, who gave birth to the Gloved One's other kids before he dumped her. 

"[Jackson] had a very lonely childhood. His motivation in having children is partly because of that, but mainly because he loves them," said producer Gary Pudney.

For more news, entertainment and sports coverage, click here for NYPost.com.