It's been a rough few days for fans of the Fast and Furious franchise. After a nasty feud erupted between Dwayne Johnson and Vin Diesel on the set of Fast 8, the week appears to be ending on a more heartwarming note. During one of his "xXx Thursdays" yesterday, Vin took to Instagram to share a bittersweet story about his close friend and costar, the late Paul Walker. "My son earlier this morning, we were going over his birthday list, and he said, 'I want Paul to come,'" he told the camera. "And then he said, 'I really miss him.' Paul came to his second birthday in London while we were shooting Fast 6." The xXx: Return of Xander Cage actor has never been shy when it comes to opening up about how Paul's death affected him, but this small moment was particularly emotional since it involved Vin's 6-year-old son, Vincent. Watch the video above, and then see how the Fast 8 cast is weighing in on the recent drama.