updated 07/03/2008 AT 1:00 PM ET
•originally published 07/10/2008 AT 1:20 PM ET
Olivia Newton-John married natural-health businessman John Easterling in two secret ceremonies, her rep tells PEOPLE exclusively.
Only the bride and groom attended the Incan spiritual ceremony held on a mountaintop outside of Peru on June 21. The couple then returned to the U.S. and made their union legal with a beachfront wedding in Florida’s Jupiter Island on June 30.
The newlyweds kept their nuptials hush-hush until a 4th of July barbeque held at the singer’s Malibu home, where Newton-John, 59, surprised their guests with the good news.
Newton-John and Easterling, 56, founder of the Jupiter, Fla.-based Amazon Herb Company, met through a friend more than 15 years ago but only became romantically involved last year.
Click here to see a gallery of Olivia Newton-John covers on PEOPLE!