Hilary Duff and Mike Comrie looked like very friendly exes when they headed to a Halloween party together over the weekend. Paparazzi photographed Duff and Comrie walking hand-in-hand into the Casamigos Annual Halloween Party in Los Angeles Friday night. The 27-year-old actress dressed as a tooth fairy, according to Us Weekly, and was all smiles as she strolled into the bash with her estranged husband, who was decked out in a tuxedo. On Saturday, the duo was spotted together again buying Halloween...