Sizzling hot new megastar Reese Witherspoon’s hunky hubby Ryan Phillippenearly got booted out of her “Legally Blonde” premiere — bodyguards mistook him for a pushy, grungy fan! Said Reese: “Ryan was so dressed down . . . and I was all in hair and makeup, dressed up. A security guard came up to my husband and shouted, ‘STEP BACK AND STOP CROWDING MISS WITHERSPOON!’ ” Giggled Reese: “Ryan kept saying, ‘I’M HER HUSBAND!’ And then I just said quietly, ‘That’s my husband.'” And that was THAT, says Ms. Star-Thang!