Britney Spears' younger son, Jayden James Federline, made a rare public appearance at the Dior Cruise 2027 fashion show and reportedly caused a stir at a Los Angeles restaurant.

"Circus" in Aisle 5! Britney Spears' boys, Sean Preston and Jayden James Federline, were snapped running errands in a rare public outing together ... and look how they've grown! Sean, 20, and Jayden, 19, were seen out in Calabasas, California,…