Australian Remy Gardner, son of 1987 500cc world champion Wayne, will move up to MotoGP next season.
The 23-year-old is leading the Moto2 championship for the Red Bull KTM Ajo team after six rounds and took his first win of the 2021 season at last weekend's Italian Grand Prix at Mugello.
His MotoGP debut will come 30 years after his father, the first Australian to win the top class of grand prix motorcycling, retired in 1992.
The youngster, who has come up through KTM's rider academy, competed for Tech3's Moto2 team in 2017 and 2018.
"It's a dream come true for me and what we have worked for up until this point. It's an incredible chance for me and I cannot wait to ride the bike," said Gardner.
"Right now we need to focus on finishing 2021 in a strong way. I want to thank also everyone who has supported me to reach MotoGP. We're just getting started."
Tech3 have Spaniard Iker Lecuona and Italian Danilo Petrucci as their current riders, with one of them now set to leave at the end of the year.
KTM Motorsport director Pit Berier said it was a pleasure for the team to bring Remy to MotoGP given his speed and ability for Moto 2.
"Remy is a typical racer. He's super-determined and never gives up," said Berier.
"He's exciting to watch and we're looking forward to working with him in this next step."