By Dylan Howard - Senior Executive Editor, Star magazine

Michael Jackson secretly left behind an almost billion-dollar secret art fortune that is now at the center of an international tug of war, Star has exclusively learned.

The never-before-seen collection would have insured the King of Pop's surviving children were looked after for life. But in a startling twist, the secret vault has been sold out from underneath them, at a 'bargain basement' price, relatively speaking.

Lawyers running the late Thriller singer's estate are moving to block the $87.7 million sale to an undisclosed international businessman, in a desperate attempt to return the incredible treasure to Prince, 13, Paris, 12, and Blanket, 8, and their guardian, Jackson's mother Katherine.

In an astonishing appraisal of the 182-pieces, obtained exclusively by Star, the “rare intact major collection” was valued at a whopping $902.52 million, with “