Since Ryan Reynolds and Scarlett Johansson announced their split back in December fans have been eager to see who Ryan would date next. Well, mystery solved: Insiders say he's now really friendly with Charlize Theron."They've been dating for weeks!" one spy shares. "They're exclusive, and it's very hush-hush."Looks like Mr. Reynolds likes older ladies, too - He's 34 and his new pal's 35.Sources say ...