Madonna was planning surprise appearance at Jackson show

Madonna was planning to join Michael Jackson on stage during his comeback tour.

According to her manager Guy Oseary, the Queen of Pop wanted to make a surprise appearance at one of Jackson's O2 arena concerts in London.

The dates were due to start in July (09) and the 'Material Girl' hitmaker was all set to be a special guest.

"A month ago Madonna told me she wanted to do a surprise performance at one of Michael Jackson's UK shows," Contactmusic quoted Oseary as stating on his Twitter.com blog.

Jackson apparently died after suffering a heart attack at his home in Los Angeles.

Madonna has revealed that she 'can't stop crying' over Jackson's sudden death.