Who sang cant take my eyes off of you in conspiracy theory film staring mel Gibson?

The song "Can't Take My Eyes Off You" is featured in the 2001 conspiracy thriller film "Conspiracy Theory", starring Mel Gibson and Julia Roberts.

However, the version of the song used in the film is not a new recording. It's a well-known version from the 1960s originally performed by Frankie Valli, a popular singer from the group The Four Seasons.