It was a big moment for her little sister, but Venus Williams didn't even realise that Serena had won.
The younger Williams sister beat Angelique Kerber 7-5 6-3 in the Wimbledon final to win her 22nd grand slam title, but footage shows Venus was slow in clocking what was going on.
Beyonce, in Serena's box alongside her husband Jay Z, also appeared to miss the moment - but she was up on her feet much quicker than Venus was.
Venus said: "Actually, I thought the score was 5-3. I don't know what the deal was.
"To be honest, I lose the score a lot in my singles and the doubles. A lot of the time I don't know when we're serving or returning.
"I do that a lot. I'm not sure why I thought it was 5-3. I missed the moment. I'm like, 'Why is everybody standing?'
"I thought, 'Wow, this break is really important'.
"I've done that a lot. I've done that literally on match point. Once in the doubles, too, I thought it was a break and the match was over. So I do it a lot."
Venus seemed more clued up when she and Serena combined to win the doubles title later in the evening, beating Timea Babos and Yaroslava Shvedova 6-3 6-4.