This week saw the seventy-fifth wedding anniversary of former President Jimmy Carter and his wife, Rosalynn - and to celebrate, the pair threw a star-studded bash with over 300 guests.

"I want to express particular gratitude for being the right woman that I chose for my wife," Jimmy said at the party in his hometown of Plains, Georgia. Rosalynn echoed the sentiment, adding: "It's wonderful to celebrate with so many friends. It's just so good to have you all here and I thank you for making it a good evening, a good time for us to be here and to be with friends we care about very much."

The pair tied the knot on July 7th, 1946, in Plains, and this anniversary marks the longest-married presidential couple in American history. Jimmy is now ninety-six, making him the longest-lived of the forty-five men who've served as president of the United States, too.

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The anniversary party on Saturday had an impressive guest list, including former POTUS Bill Clinton and former secretary of state Hillary Clinton, alongside U.S. House Speaker Nancy Pelosi and media businessman Ted Turner. The Carters also invited their own personal staff from their time in the White House, plus representatives of the charity Habitat for Humanity. But perhaps the most exciting guests came in the form of country music stars Trisha Yearwood and Garth Brooks.

These 2 huge names in country music also brought along a very special gift for Jimmy and Rosalynn and they actually met the Carters privately before the party to share the gift with the pair.

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And the gift in question? A red convertible built-in 1946 - the year the Carter's were first married. The Carters' close friend, Jill Stuckey, told PEOPLE the gift arrived the previous Wednesday and was stored by the Secret Service in an area of the couple's compound in order to keep it as a surprise.

And it seems the gift went down a treat! "Bright eyes and big smiles and... very excited time, but there was so much special [about the day] because the people that were here from all aspects of their lives," Jill confirmed.

It seems the entire event was a huge success. "There were people from their church. Nancy Pelosi was here, and the Clintons were here and Ted Turner — who they've gone fishing with forever and are close personal friends with," Jill went on. "All aspects of their life were covered, so it was just a memory lane."

And as for who took charge of the party planning? Well, it seems Jimmy Carter was very hands-on. "He still, at ninety-six, managing every little aspect of this special get-together," Jill said. The 3-hour-long party saw guests indulging in hors d'oeuvres and a celebratory cake. Congratulations!