Alyson Stoner celebrated a birthday she won't soon forget. "This year, I was unexpectedly with Jane Goodall on her 91st birthday," the author, 31, reveals exclusively in her 25 Things You Don't Know About Me feature in the latest issue of Us Weekly, on newsstands now. "More unexpectedly, Chris Martin surprised the room full of environmental advocates and led us in singing 'Happy Birthday.'" A longtime activist, Stoner lets fans into her world in her new book, Semi-Well-Adjusted Despite Literally Everything.