“Celebrity Apprentice” host Donald Trump cut the red carpet line and sailed past the cast of “Parenthood” at the NBC upfront presentation Monday afternoon. Spies tell us Erika Christensen turned to castmate Sam Jaeger and whispered, “I think we just got Trumped,” while giving his signature “You’re fired!” hand gesture. Meanwhile, another witness overheard “Heroes” star Greg Grunberg telling a friend: “While I was at a recent con vention, someone told me they canceled ‘Heroes,’ but five minutes later I got a phone call from NBC to tell me not to worry, you’ve been cast in ‘Love Bites.’ “