Pregnant Britney Spears had another 'hospital dash' drama after complaining of excruciating stomach pain.

The 23-year-old pop star was looking after husband Kevin Federline's little daughter, Kori, when she had to be rushed to hospital for emergency tests, reports Sky News.

This comes just weeks after it was feared Britney was having a miscarriage. It later emerged that she had suffered premature separation of the placenta from the uterus.

After 90 minutes of extensive tests, doctors at the University of California Los Angeles hospital in Santa Monica gave her the all-clear, but ordered the star to do as little as possible.

"Britney had been taking it easy on doctors' advice. She was playing with Kori outside the studios (where Kevin was having a recording session). She started to look unwell and was holding her stomach. She called Kevin out of the studio to tell him she was getting worse," a source was quoted as saying.