LEGO Masters Jr. is an American reality competition series that premiered on Fox in 2025. It is a spin-off of Fox’s LEGO Masters — itself based on the long-running British series of the same name. The junior edition introduces a fresh format designed to showcase the creativity and imagination of a younger generation of builders.
The series pairs each junior contestant duo — aged 9 to 17 — with a celebrity partner, forming teams that compete in large-scale LEGO building challenges across four episodes. Celebrity partners for the inaugural run included Ravi V. Patel, Andy Richter, Jordin Sparks, Alison Sweeney, and Porsha Williams.
In each episode, teams design and construct impressive LEGO creations intended to impress the judging panel, with the weakest build sending a team home. The four-week run culminated in a finale in which the top teams faced off for the $50,000 grand prize, the LEGO trophy, and the title of LEGO Masters Jr. Champions.
Judging duties are handled by two Brickmasters: Amy Corbett, a senior LEGO Group creative designer and returning judge from the parent series, and Boone Langston — a LEGO designer and finalist from LEGO Masters Season 1 — who steps in to replace longtime Brickmaster Jamie Berard. Their combined expertise in design, construction, and LEGO craftsmanship provides both technical authority and creative guidance throughout the competition.
Kelly Osbourne hosts the series. A television personality, fashion commentator, and former co-host of Fashion Police, Osbourne previously appeared as a guest on the adult version in 2023, before taking on hosting duties for the junior edition.
