Page Six is accusing the all-knowing, all-perfect Natalie Portman of taking a sledgehammer to a ballet dancer's happy home and snatching him away to hump pesticide-free turnips with her in the garden. Or whatever the hell she's into. A source is saying that Natalie's vag has been pirouetting on Benjamin Millepied's peen since the fall. Natalie and 32-year-old Benjamin met on the set of The Black Swan. Benjamin, who is a member of New York City Ballet, is one of the movie's choreographers. Accord