A huge shakeup is coming on the Formula One grid ... with seven-time champion Lewis Hamilton expected to leave Mercedes -- his home since 2013 -- for Ferrari next year.
Multiple outlets are reporting the shocking development Thursday morning ... and an official announcement could come as early as this afternoon.
39-year-old Hamilton is one of the most dominant drivers in F1 history -- he won six titles with Mercedes from 2014 to 2020 ... after securing his first championship with McLaren in 2008.
There had been rumors connecting Hamilton and Ferrari for a while .