Michael Jackson (search) fell to the ground as he tried to make his way through a throng of hundreds of fans outside the Victoria Palace theater, where he watched the stage version of the movie "Billy Elliot." (search)

Security staff forced a path for Jackson, 47, through the admirers and photographers standing outside the theater so he could reach the front door. But the singer fell in the commotion.

At the performance, Jackson mingled with other spectators, chatting and signing autographs.

"He talked to us saying hello and there were a lot of people around him," said Roxanne Wisenberg, 47, of San Diego. "He was very nice and his children were with him."

Jackson was in London to work on recording a song to benefit Hurricane Katrina victims. He was staying at the Dorchester Hotel in Park Lane, where fans gathered outside in hopes of seeing him.

The visit to Britain was believed to be his first since his acquittal in June of child molestation charges. He has spent much of his time in Bahrain.