Who knew that Jennifer Lopez and Ruth Bader Ginsburg were such chums!

J.Lo personally tapped RBG for marriage advice recently, according to the Supreme Court Justice herself.

During a talk at the Library of Congress National Book Festival at the Walter E. Washington Convention Center this weekend, the 86-year-old icon told reporters that the singer tracked down her number, called her up, and asked her for the secrets to a happy marriage.

“I was called up about a month or so ago by Jennifer Lopez, and she said she would like to meet me and introduce her fiancé Alex Rodriguez,” RBG explained. “She mostly wanted to ask if I had any secret about a happy marriage.”

Don’t believe us? See for yourself: