Winehouse spokesman Chris Goodman says Winehouse fainted Monday afternoon at her north London home. Goodman says her manager's assistant was there and caught her as she fell.
Goodman says Winehouse's father, Mitch, took her to a hospital as a precaution.
Goodman says Winehouse is undergoing tests and may be kept in overnight.
Winehouse's career is flourishing, 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.
