Let's make this birthday one to remember.

77 years old (Born on September 26, 1948)

Happy Birthday, Olivia Newton-John! You've danced and sung your way into our hearts, teaching us that we're hopelessly devoted to good music and unforgettable hairstyles. From rocking leather pants in "Grease" to topping Billboard charts repeatedly, you've given fans countless reasons to get "Physical" (though most of us should probably leave the dancing to professionals).

With four Grammys and enough chart-topping hits—five No. 1 singles, two No. 1 solo albums—to fill our hearts for generations, it's clear you're the one we all still want. Here's hoping your birthday is as timelessly fabulous as your legendary career!