Former *NSYNC boy-bander JC Chasez was a hero saving a baby in Miami Beach on New Year’s Day. A helicopter flew so close to the beach in front of the Fontainebleau that the umbrellas in the sand flew up from the force of the rotors. One parasol began hurtling toward a stroller carrying a 1-year-old baby girl. Chasez sprung into action and grabbed the umbrella before it fell onto the child. Hotel security confirmed the incident, and sources say Chasez was “sweet and humble” about his heroics. The night earlier, Chasez had partied at a Fontainebleau private bash hosted by “Gossip Girl” star Chace Crawford.