A timeline of Lady Gaga and Joe Biden's friendship

How did Mother Monster and Amtrak Joe become BFFs?

US singer Lady Gaga performs prior to Democratic presidential candidate Joe Biden speaking during a Drive-In Rally at Heinz Field
(Image credit: Photo by Jim Watson/AFP/Getty Images)

There's the famous bromance with Barack Obama, the longtime friendship with John McCain, and, of course, the current partnership with running mate, Kamala Harris. But there's one Joe Biden buddy that's always been our favorite: Lady Gaga.

The "Stupid Love" songstress performed the national anthem at the presidential inauguration earlier today, alongside Jennifer Lopez—who sang "This Land is Your Land" and squeezed in "Let's Get Loud"— and the incredibly talented poet Amanda Gorman. But it's not the first time she's showed up for Joe. Let's look back at the enduring friendship between this lovable odd couple:

2016: Then-Vice President Joe Biden introduced Lady Gaga at the 88th annual Academy Awards ahead of her performance of "Til It Happens To You".

2017: The duo joined forces as part of the Obama administration's "It's On Us" campaign, aimed at ending sexual assault on college campuses.

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2018: After a two-year hiatus, Biden rejoined Instagram, following only 16 accounts, including Barack and Michelle Obama, Jeni's Splendid Ice Cream and, of course, Gaga.

2019: When asked who were his favorite 2019 Oscar nominees while at the University of Pennsylvania, Biden proclaimed: "Bradley Cooper and Lady Gaga!"

2020: Gaga, who performed at Biden's closing campaign rally in Pittsburgh, celebrated news of the former VP's election victory on Instagram Live, stating: “Thank you so much for all the people who worked to move this country for change. I am so excited, congratulations to Joe.”

2021: Alongside fellow talents Jennifer Lopez and Garth Brooks, Lady Gaga helped her buddy Joe usher in the new administration with an inauguration performance of "The Star-Spangled Banner."