Sydney Sweeney is turning up the summer heat ... riding a Sea-Doo with a new muscular man holding her waist. The actress was all smiles Friday during her thrilling ride -- grinning ear to ear with her ...

The incident occurred at 4:30 p.m. on Friday, July 4, deputies said. A man was seen falling off a jet ski and into the lake. He was not seen again after going under the surface of the water.

Hundreds of jet ski riders took over the East River in New York City last week, providing New Yorkers with a stunning visual. The jet skis were part of the annual NYC Jetski Invasion that has been ...