After nearly 40 years of marriage, Bill Clinton and Hillary Clinton sure know how to keep their love alive!

To celebrate Valentine's Day this past weekend, Bill, 68, and his wife, Hillary, 67, reportedly traveled to Glenmere Mansion in Hudson Valley, N.Y., for a quiet spa day for two.

“[The Clintons] were very low-key, and everyone left them alone to enjoy their romantic weekend,” a source said of the couple's visit.

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Bill and Hillary on Dec. 20, 2014.

After a relaxing day of being pampered at the luxury spa, Bill and Hillary — who wed in October 1975 — allegedly enjoyed a romantic dinner in the country home's supper room, the insider added.

Related Story: Bill Clinton Gushes About Granddaughter Charlotte — and Reveals He's "Happy" To Change Diapers!

By Sunday evening, Bill was back in NYC to sit courtside at the NBA All-Star Game.

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Bill at the NBA All-Star Game in NYC on Feb. 15, 2015.

During the game, the former President took to his Twitter account to share a funny photo of him sitting behind 7-foot-2 retired basketball player Dikembe Mutombo.

"Dikembe @officialmutombo – DOWN IN FRONT!! #NBAAllStarNYC," Bill captioned the snapshot.

'Page Six' first reported this news.