The Celebrity Wedding: Mark Zuckerberg and Priscilla Chan
When It Took Place: May 2012
Why It Was So Crazy: Although the couple opted to have their ceremony and reception in the backyard of their Palo Alto, California home, they spared no expense on it. Green Day's Billie Joe Armstrong sang during the wedding. The food, served to more than 100 guests, was catered by their two favorite local restaurants. And Zuck even wore a suit and tie for the occasion! But the craziest thing of all was that the couple managed to surprise their guests—and more importantly, the media—by billing their wedding as a "graduation party" for Chan, who had graduated from medical school. Good one, guys. No wonder this got almost a million likes on Zuck's Facebook account.