X-Men: Dark Phoenix is currently filming in Canada, and the production has reportedly added a new cast member: 8-year-old The Originals actress Summer Fontana.
Fontana has appeared on the IMDb page for X-Men: Dark Phoenix, listed as playing a young Jean Grey in the film, as noted by ScreenRant. Fontana's own imdb page lists the role, as well. And while that might not normally be enough evidence, Fontana also happens to have been spotted in the right place at the right time:
So is this confirmation that Fontana is playing young Jean Grey in some kind of Flashback in X-Men: Dark Phoenix? There's nothing official yet, but it's good enough for a Sunday, especially the one a week after Comic-Con when there's a severe draught of clickbait article topics.