Pierre Gasly has ended his nine-year spell under Red Bull's wing by signing a deal with Alpine for 2023.
Gasly has long been touted as the driver to take over from Aston Martin-bound Fernando Alonso since Alpine failed to sign reserve Oscar Piastri to a full-time F1 seat.
Although the Frenchman had a contract with AlphaTauri for next season, Red Bull advisor Helmut Marko had previously stated Gasly could leave, providing it lined up another driver as a replacement.
Nyck de Vries will replace Gasly at AlphaTauri with the announcement made shortly after the 26-year-old's move was confirmed.
Gasly, who joined Red Bull's junior development programme in 2014, said: "I am delighted to join the Alpine family and begin this new chapter in my Formula 1 career.
"Driving for a team that has French roots is something very special. I know the strengths of Alpine having raced against them over the past couple of years and, clearly, their progress and ambition is very impressive.
"I wish to thank Red Bull as this marks the end of our 9-year journey together. It is thanks to their trust and support that I became a Formula 1 driver, and what we’ve achieved with Scuderia AlphaTauri over the last years has been very special.
"Looking ahead, I want to give the maximum and utilise all my experience to fight for podiums and ultimately contribute to Alpine’s fight for championships in the future.”
Prior to this weekend's Japanese Grand Prix, Gasly has so far competed in 91 races for AlphaTauri and 12 during an ill-fated half-season with Red Bull in 2019.