The 40-year-old will team up with Charles Leclerc at the Scuderia this year as he targets an elusive eighth world championship title, having endured several years of frustration at his former employers.
While Hamilton - who was unveiled at the team's base in Maranello on Monday - will make his official racing debut for his new squad at the Australian Grand Prix in March, he has already got behind the wheel of a Ferrari at the nearby Fiorano circuit to participate in a test run.
Twenty days of old car running are currently permitted by the rules, meaning Ferrari can complete a maximum of four days using drivers entered in this year's championship.
Having been unable to participate in the 2024 post-season testing in Abu Dhabi last December, Hamilton is desperate to get some much-needed time in the cockpit.
The 105-time race winner has been eager to share his excitement about the prospect of lining up for Ferrari in 2025, but admitted it was an incredibly difficult decision to leave Mercedes, with whom he won six drivers' championships.
His shock departure was also felt by his former boss Toto Wolff, who spent much of last season trying to find a replacement for the Brit, with Kimi Antonelli the man selected.
Despite Hamilton opting to join a main rival on the grid, Wolff has had nothing but praise for his ex-driver, both personally and professionally.