Amy Winehouse fainted Monday at her north London home and was hospitalized, her spokesman said.

Winehouse lost consciousness but an assistant caught her before she hit the ground, spokesman Chris Goodman said.

"She quickly recovered and her father, Mitch, took her to hospital as a precaution," Goodman said in a statement.

Winehouse had spent the afternoon signing autographs for Canadian fans who were standing outside her house. She collapsed after they left.

Goodman said doctors are unsure what caused the collapse and the 24-year-old singer was undergoing tests.

She may stay in the hospital overnight as a precaution, he said.

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.