Bill Clinton, Dr. Ruth watched together

Serena Williams began her final U.S. Open with an opening-round win over Danka Kovinic in Flushing in front of a crowd rooting her on so hard.

Among those fans were so many celebrities: Lindsey Vonn, Spike Lee, Hugh Jackman and so many more.

But there was one pairing of big names that had Twitter abuzz: Former President Bill Clinton was sitting next to Dr. Ruth Westheimer, the “world-renowned psychosexual therapist,” per her Twitter profile.

Everyone wanted to know what they were saying to each other, and there were a few times the cameras cut to them chatting.

Here’s a roundup:

So many tweets