The Summer I Turned Pretty has found its newest star in Gavin Casalegno! Jenny Han fans will have to head over to Amazon if they want to check out the next of her novels to get the adaptation treatment. Earlier this year, we learned that Amazon Studios is gearing up to turn the authors The Summer I Turned Pretty book series into a television series. Now, it’s looking like the series adaptation in question has found one of its stars. According to Deadline, actor Gavin Casalegno has officially signed on to take on a lead role in the forthcoming Amazon Original series.