Celebrities Switch into their 2nd Outfits for the Met Gala After Parties on May 7, 2019. Pictured: Hailey Bieber. (Photo by DIGGZY/Splash News and Pictures)

A runner competes in the Great Wall Marathon at the Huangyaguan Great Wall outside Beijing, China, May 18, 2019. (Photo by Thomas Peter/Reuters)

American actress and singer Victoria Justice thanks Alabama for “the good times” early May 2022. (Photo by victoriajustice/Instagram)

Valik Vladimirovich plays dressed as a soldier in Stoyanka outskirts Kyiv, Ukraine, Monday, May 30, 2022. (Photo by Natacha Pisarenko/AP Photo)

A couple embraces at the railway station in Kramatorsk, on May 20, 2023, amid the Russian invasion of Ukraine. (Photo by Sergey Shestak/AFP Photo)

American actress Joey King in the second decade of May 2024 shares a silly selfie sipping a cocktail. (Photo by joeyking/Instagram)

Raising a flag over the Reichstag is a historic World War II photograph taken during the Battle of Berlin on 2 May 1945, by Yevgeny Khaldei.

A competitor participates in the Tough Mudder challenge near Henley-on-Thames in southern England May 2, 2015. (Photo by Eddie Keogh/Reuters)