That particular shoot of SI's last year's Swimsuit issue was in Palm Springs Air Museum. Based on their collection, I'd say it's a B-25 Mitchell. Can't open the cockpit that way in Lockheed Harpoon, B-17, C-47 Goose, Trader, or Catalina (well you can open but it would be offset). A-26's pilot was alone on the flight deck.
Looking at Google Image Search (pictures of the cockpit, although Genevieve Morton is a welcome sight too) I'd be almost sure that it's a B-25.