http://www.newsoftheworld.co.uk/showbiz/michae l_jackson/443550/Im-real-father-Michael-Jackso ns-girl-claims-Mark-Lester.html
Haven't read the story but caught some of it on Five Live yesterday whilst driving.
If it is true that Mark Lester had donated sperm - put that together with a definite resemblance between the two children (this was what the correspondent on Five Live said yesterday) and you have a potential case.
Should he have waited? Probably - but we don't know the full details. If the Jackson family had said you can't see these kids ever again, full stop, then the media may well be the only way he can gain leverage and force a paternity suit.
If it does prove to be a false allegation (that he donated sperm) then I hope that the Jackson family sue him for everything he has got (not a lot!)