Seventy-five guests including Aniston's costars Courteney Cox and Lisa Kudrow, as well as Chelsea Handler, Jason Bateman, Emily Blunt and John Krasinski, Ellen De Generes and Portia de Rossi, Will Arnett, Tobey Maguire and wife Jennifer Meyer, and Jimmy Kimmel attended what they thought was going to be Theroux's birthday party.

Around 30 guests (including probable bridesmaid Beyoncé) attended the intimate nuptials, which didn't make the news until after they'd ended.

Keibler and Pobre had a March 2014 wedding that was totally unexpected for a number of reasons.

Johansson married her journalist fiancé Romain Dauriac shortly after giving birth to their daughter Rose in September 2014, but they didn't announce their marriage until that December!

She'd been spotted wearing a wedding ring, but stayed mum in the meantime. After nine long years and six adorable children, the ultimate A-list couple married at their French estate, Chateau Miraval, with just their closest friends and family (including their six children) in attendance in August 2014.

It turns out, court documents show that the pair married on June 25, meaning they kept their marriage quiet for more than a month. These two got married after a whirlwind nine-month courtship (and four-month engagement).

Even though that's the amount of time it takes most couples to plan a wedding, they managed to coordinate a gorgeously rustic affair in Topanga Canyon in April 2015, to which Reed wore a Claire Pettibone wedding dress.When all eyes are on you, it's only natural to want a wedding that keeps you completely out of the spotlight.Here, we focus on the intimate parties and secret ceremonies that show how even the biggest celebrities still know how to pull a fast one on us.Others, like Zooey Deschanel and Jacob Pechenik's, were so undercover that it took months for the news of their marriage to even surface.What's amazing is that many of these under-the-radar affairs were total blowout celebrations, with hundreds of guests that managed to stay mum about the whole thing—and barely have a photo to show for it.Franco popped the question with an Irene Neuwirth–designed rose-gold ring set; the actress revealed her stunning rock at the premiere of The actress and longtime boyfriend were married during a secret ceremony in Byron Bay, located in Australia, in December 2016.