Ed O'Neill has been an actor in Hollywood for decades and is especially know for his roles in Married With Children and Modern Family.
That being said, he's especially accustomed to signing autographs and posing for pictures, but this one in particular will likely always stand out to him.
Even his daughter called him a "moron" after she saw it.
O'Neill was at LAX airport when a fan came up and asked for a picture, and he obliged. It wasn't until he checked Twitter the next day that he realized his mistake.
Yep, Britney Spears is a superfan of Modern Family.