Bella Thorne at Barnes and Noble for signing

How did the average person know that Bella Thorne was at Barnes & Noble at Dadeland Mall Sunday? All the screaming and shrieking. About 400 fans (mostly young women — female power!) came out to see the Shake it Up actress, who signed copies of her Seventeen cover and chatted about her role as Adam Sandler’s daughter in the comedy Blended, out Friday. For someone just 16, she has a lot going on: Thorne just released a single, Call it Whatever, and co-wrote a young adult book, Autumn Falls, about a teen’s experience with magic. At least it’s not all work, no play. Busy Bella was also spotted on the beach in a bikini, with the Instagram caption, “I’m in Miami B—-…”