
UNITED STATES - SEPTEMBER 09: WELCOME BACK, KOTTER - John Travolta Portrait - Pilot -, 9/9/75, John Travolta played Vinnie Barbarino, the leader and ladies' man of the Sweathogs, a class of delinquents in a Brooklyn high school., (Photo by ABC Photo Archives/ABC via Getty Images)
Happy 61st Birthday, John Travolta!
Click through the gallery above to see the movie star's hair evolution from 1975 to 2015. Spoiler alert: His look changes A LOT!