John Travolta still loves to dance. He’s boogied to the Bee Gees, done the hand jive with Olivia Newton-John and even waltzed with Princess Diana at the White House.

But his favorite dancing partner remains his longtime love and wife of 23 years, Kelly Preston. At the wedding of their niece Rachel Claire in LA earlier this year, “They danced the night away in each others arms,” says a close friend.

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John and Kelly in January 1990.

“He and Kelly were constantly taking to the dance floor, and when they danced to slow songs, he held her close as if they were a teenage couple at their high school prom,” the insider added.

It’s a testament to the couple’s unbreakable bond, which has remained strong throughout some of life’s toughest challenges.

Related Story: John Travolta and Olivia Newton-John Are Still Great Friends 36 Years After ‘Grease’!

From the devastating loss of their teenage son, Jett, nearly six years ago, to ceaseless questions about their membership in the Church of Scientology and rumors of John’s relationships with other men, somehow John, 60, and Kelly, 52, have kept their marriage solid.

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John and Kelly in June 2012.

What’s their secret? It’s simple, John tells ‘Closer’ in an exclusive interview: He and Kelly work at it. “I think after the first few years of a relationship, if you don’t create it, it’s not going to exist,” John reveals.

“You have to feed it and you have to fuel it,” he adds. “And if you let it go, as if by magic, it will disappear by magic.”

To read the full story on John and Kelly pick up the new copy of ‘Closer Weekly,’ on newsstands now!