Grammy-winning British singer Amy Winehouse was taken to hospital during her prolonged holiday in St Lucia after fainting, her spokesman said Saturday.

The 25-year-old "Back to Black" and "Rehab" songstress was kept in for a night for observation after tests showed she was dehydrated.

Her British-based publicist Chris Goodman said: "She fainted at home (in St Lucia) and they took her in for observation, mainly to do with her medication to check everything was OK. They told her that she was dehydrated and needed to drink more water."

Winehouse had been "running around" with a group of children before she passed out, he said.

The singer has had a well-publicised struggle with drugs, but has appeared to have been in improved health in recent months after turning her back on the London party scene and holing up on the Caribbean island.

Her spokesman confirmed that Winehouse has obtained an injunction banning paparazzi taking photographs outside her London home.

Photographers are barred from following or approaching her within 100 metres (yards) of the house.