LOS ANGELES: JOHN Travolta is being kept on a tight leash following Leah Remini‘s defection from Scientology. Church officials are apparently worried the Hollywood actor might jump ship too. At the 87th birthday celebration for Tony Bennett in L.A., witnesses say John and his daughter, Ella Bleu, 13, were being followed by a Scientology minder named Angie. “She spent most of the night aggressively staring at anyone Johny talked to,” a source said. “It was very uncomfortable, but John acted like it was normal.”–XP