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Find out how the couple sprung the surprise wedding on their guests!

Jennifer Aniston and Justin Theroux just gave a master class in hiding in plain sight.

The couple, who exchanged vows in front of more than 70 family members and friends on Wednesday at their Bel Air, California, home, successfully kept the affair a secret – and they did it without leaving their own backyard.

“Guests were told it was a birthday party for Justin. Jen and Justin wanted to surprise guests, and guests were certainly surprised,” a source tells PEOPLE. “Jen has been very good at keeping her wedding planning secret. Only her closest confidants knew that the party was actually a surprise wedding.”

People magazine has the rest of the story here.