The official trailer for The Summer I Turned Pretty season 3 reveals more of Belly's life with Jeremiah, their wedding plans, and Conrad's return. The third season of The Summer I Turned Pretty is slated to be the show's last, as it will adapt the final book in Jenny Han's trilogy, We'll Always Have Summer. With Belly (Lola Tung) and Jeremiah (Gavin Casalegno) seemingly settled in their relationship and Belly looking forward to her senior year of college, only one thing could truly rattle their love story: Conrad's (Christopher Briney) lingering feelings for Belly.