EDITOR'S NOTE: We're announcing some exciting One Direction news on Monday! To hold you over until then, we're reposting all of your favorite 1D features. Enjoy!

Today is One Direction's four year anniversary! Time sure flies, huh? To celebrate the big day, we're taking a look back at some of our favorite 1D moments. Remember that time Niall Horan was spotted running around his Buenos Aires hotel in just his boxer briefs? It's still our favorite video of all time.

Click through to see more times the guys were caught in their underwear, then let us know in the comments below which moments will forever be your favorite.

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