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J-j-jittery JIMMY FALLON – terrified of screwing up BARBRA STREISAND’s triumphal return to “The Tonight Show” for the first time in 50 years while America eyeballed – warned spooked staffers: Don’t dare speak – and never PEEK!
Said a show source: “A very nervous Fallon told staff to treat Barbra like a deep-end diva – do NOT make eye contact or engage her in any way! But a young intern ended up spilling the beans as he ran around doing his thing – and was suddenly called over by Barbra herself, who demanded to know why everyone kept acting like she was … invisible!