Olivia Newton-John - Then
The "Grease" star is also remembered for her breakout video "Let's Get Physical," which set the bar for workout videos everywhere. The was a double and triple threat, skilled at singing, acting, and dancing. Adding the workout lifestyle to the mix made her one of the 80s most unstoppable stars.
Olivia Newton-John - Now
The four-time Grammy winner has mastered five number-one Billboard Hot 100 singles. The "Grease" soundtrack hit, "You're The One That I Want" granted her with the unofficial title of singing on one of the most successful soundtracks in history. She still tours today, though mostly just in Australia and the U.S.