Harry Potter star Daniel Radcliffe and his girlfriend Erin Darke posed for an adorable snap on the red carpet at the screening for his new movie, The Lost City, in New York on Tuesday.The couple were all smiles as the fantasy star wrapped his arms around beautiful blonde Erin, 37. Daniel, 31, who plays a hilarious villain in the new romcom action movie alongside Sandra Bullock and Channing Tatum, opted for a casual outfit at the screening.The star wore his brunette locks in a casual swept-over style and donned a printed black and white polo top and jeans for the occasion.