A spokesman says soul diva Amy Winehouse is having more tests in a London hospital after fainting at home.

Spokesman Chris Goodman says initial tests were inconclusive and Winehouse will have more Tuesday while being kept under observation.

Goodman says the 24-year-old singer "seems to be fine in herself, but they are taking their time to be sure."

The spokesman said Winehouse collapsed at her north London home Monday after signing autographs for a group of fans. An assistant caught her before she hit the ground.

Winehouse's career has prospered despite wild nights, missed concerts and stints in drug rehab. The Sunday Times newspaper's annual Rich List has estimated her wealth at $20 million.