It’s like a teenage dream come true! Adam Brody and Leighton Meester, both veterans of the teen drama genre, have been secretly dating for weeks, sources confirm to Us Weekly.The actors, who costarred in 2011 dramedy The Oranges alongside Catherine Keener and Hugh Laurie, have been "hanging out,” the source tells Us."They were always close and friendly,” the insider added, noting that the pair would hang out on occasion during shooting for the film.Brody, 33, first landed in the spotlight as lovable comic book geek Seth Cohen on the WB’s hit The O.C. back in the early 2000s. He was most recently linked to director Lorene Scafaria, who wrote Nick and Nora’s Infinite Playlist, back in 2010.Us Weekly