Pop singer Britney Spears made a surprise visit to Miami Children's Hospital to meet with a group of sick children, hours before taking the stage Saturday.

The 27-year-old Spears spent sometime with the children and also posed for photos with them.

She's also donating 100,000 U.S. dollars to the Big Apple Circus Clown Care program, which brings clowns to young hospital patients.

Spears played at the American Airlines Arena in Miami as part of her Circus tour.

The tour to support her hit album Circus began last week before a nearly sold-out crowd in New Orleans.

(Xinhua/Agencies March 10, 2009)