Have you ever thought about what you would say to your favorite celeb if you had the chance to meet him or her? For some very lucky fans, this dream has come true -- and stars like Reese Witherspoon, Channing Tatum and Ansel Elgort are spilling exactly what went down.

Vanity Fair recently asked a bunch of A-list actors what happens to them when they are recognized on the street, and you won't believe their responses!

"'You're my best friend and you don't even know it!'" laughed Reese, quoting an ecstatic fan, while stars like Ansel Elgort and Eddie Redmayne confessed that strangers often had a hard time figuring out exactly who they are -- aside from the fact that they look like someone famous.

Of course, in the case of Steve Carrell, Jennifer Connelly or Keira Knightley, the stars are sometimes completely mistaken for another celebrity!

No matter the reaction, all of the celebrities seem to take the excited fandom in stride. Check out stars sharing their reactions in the video above!