On any given day, words come naturally to Heart Evangelista. But in this fleeting moment, they eluded her.

Last Tuesday, as she welcomed a roomful journalists to the press conference for her new reality television show, “Heart World,” she paused midway through her speech to acknowledge, and shake off, her uncharacteristic jitters.

“Kinakabahan ako, actually,” she said, breaking into a smile and fidgeting in her black Schiaparelli tank top that she wore as a dress; she bought it specifically for this event.