Britney Not Clowning Around With Donation

The popstar makes a pitstop - and a huge donation - before her concert on Saturday

Britney Spears knows everybody loves a circus. 

The 27-year-old popstar, who's currently on her Circus world tour, is donating $100,000 to the Miami Children's Hospital's Big Apple Circus Clown Care program.

The mother of two made a surprise, 30-minute visit with 40 sick children at the hospital on Saturday before her show at the American Airlines Arena. Spears posed for photos with the kids and signed autographs. 

The Clown Care program provides young patients with treatment — and laughs — from clowns with medical training.

Britney's tour, her first in five years, rolls into Tampa, Florida, tonight.