Amy Winehouse has been taken to hospital after fainting in London yesterday (June 16).

The singer is undergoing tests after passing out at her home, although she is said to have "quickly recovered".

According to a spokesperson, it's unclear what caused her to faint and she may be kept in overnight for observation.

The last two years have been tough ones for Britney Spears, who, after losing custody of her two children four months ago to ex-husband Kevin Federline, was transported to a Los Angeles-area hospital Thursday morning (January 31), reportedly for a mental-health evaluation.