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Bill Clinton kisses his wife after she introduced him at the dedication of the William J. Clinton Presidential Center in Little Rock, Arkansas, Nov. 18, 2004. Scott Olson/Getty Images

Democratic presidential hopeful Hillary Clinton and former President Bill Clinton Sunday celebrated their 40th wedding anniversary, each tweeting pictures from their dating days to mark the occasion. The pair tied the knot Oct. 11, 1975, in the living room of their Fayetteville, Arkansas, home in a ceremony attended by just 15 guests, ABC News reported.

The two met in 1970 at Yale University, and in a 2003 interview, Hillary Clinton said the attraction was "immediate."

In an interview with Lena Dunham for her website, Hillary Clinton said she turned down the first proposal because "I was terrified about losing my identity," CBS reported.

The former secretary of state's mother, Dorothy Rodham, sprang for a honeymoon in Acapulco, Mexico.

The couple made a pact, Bill Clinton said in a BBC interview: "I told her when she got elected to the Senate from New York that she’d given me 26 years, and so I intended to give her 26 years. Whatever she wanted to do was fine with me."

The former president described his wife as "the rock in our family" in a CNN interview. "I trust her with my life, and have on more than one occasion," he said.

The Clintons' marriage went through a rocky time during his presidency amid allegations of infidelity first with Gennifer Flowers and later with Monica Lewinsky. Other women also stepped forward with allegations of advances made by Bill Clinton, and phrases like "bimbo eruption" became part of the lexicon. In denying he had sexual relations with Lewinsky, he famously said it depends the definition of "sexual relations."

The Clintons became grandparents last year when their daughter Chelsea gave birth to Charlotte.

Chelsea Clinton married Marc Mezvinsky in 2010 in a lavish celebration in Rhinebeck, New York.

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Former U.S. President Bill Clinton walks Chelsea Clinton down the aisle during her wedding to Marc Mezvinsky at the Astor Courts Estate, July 31, 2010, in Rhinebeck, New York. Genevieve de Manio/Getty Images