The rockstar bumped into the The Four Seasons frontman while at the airport, prompting Kravitz to snap selfies of the pair and pen a message to the 90-year-old music great, which was posted to Instagram on Saturday.
Valli, who has a star on the Walk of Fame himself, rose to fame in the 1960s, leading The Four Seasons to several hit songs, including "December, 1963 (Oh, What a Night)" and "Walk Like a Man." The group also inspired the musical Jersey Boys.