Photo: Gotham/GC ImagesSerena Williams’last US Openis making for some memorable moments — both on and off the court.During thetennis legend’s first gamein the tournament on Monday,former president Bill Clinton, 76, was in attendance with an unexpected guest:sex therapist Dr. Ruth Westheimer.Throughout the game, theAsk Dr. Ruthstar, 94, and the politician talked plenty, often smiling, laughing and nodding at one another. At one point, Dr. Ruth appeared to give Clinton a playful slap on the face.When the camera first panned to the duo, ESPN analyst and former tennis star John McEnroe asked, “Who knows what they’re talking about?“Trying to understand their conversation, co-analyst and former tennis player Chris Evert said, “Look at these two, they’re really involved in some sort of … She’s giving him advice,” co-analyst Chris Evert said,The New York Postreported. “She just gave him advice. Yep, ‘You shouldn’t be doing that.'““Why is his face getting redder?” McEnroe joked.R. Diamond/WireImageThough little is known about their friendship, pictures of the two date back to 1991, two years before his first term as president. According toTheMiddletownPress, the sex therapist even encouraged Clinton, who was a governor at the time, to run for the presidency.In photos, their height difference is always a stand-out: Dr. Ruth is a mere 4′7” while the former president stands at 6′2”.Though the longtime friends appeared on screen for just a few seconds, internet users went wild about what they couldn’t possibly be talking about.“Bill Clinton and Dr Ruth sitting together at the#USOpenis a million times more entertaining than tennis,” a usertweeted.“The guest situation at the#USOpenis absolutely UNHINGED,“tweetedanother, hinting to another odd pairing in the audience: boxerMike Tysonsitting next to tennis player Martina Navratilova with a dog on her lap.A representative for Clinton did not immediately respond to PEOPLE’s request for comment.Chrystyna Czajkowski/AP PhotoClinton and Dr. Ruth were not the only celebrities in attendance. Queen Latifah, Spike Lee,Bella Hadidand other A-listers were also in the stands cheering for Williams.Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.The six-time US Open winner, wholast month announcedshe was “evolving away from tennis” dazzled a cheering sold outUS Open crowdbehind her every stroke as she defeated Montenegro’s Danka Kovinic, 6-3, 6-3.She will next face Anett Kontaveit of Estonia, the No. 2 seed, in the second round.

Photo: Gotham/GC Images

Bill Clinton and Dr. Ruth

Serena Williams’last US Openis making for some memorable moments — both on and off the court.During thetennis legend’s first gamein the tournament on Monday,former president Bill Clinton, 76, was in attendance with an unexpected guest:sex therapist Dr. Ruth Westheimer.Throughout the game, theAsk Dr. Ruthstar, 94, and the politician talked plenty, often smiling, laughing and nodding at one another. At one point, Dr. Ruth appeared to give Clinton a playful slap on the face.When the camera first panned to the duo, ESPN analyst and former tennis star John McEnroe asked, “Who knows what they’re talking about?“Trying to understand their conversation, co-analyst and former tennis player Chris Evert said, “Look at these two, they’re really involved in some sort of … She’s giving him advice,” co-analyst Chris Evert said,The New York Postreported. “She just gave him advice. Yep, ‘You shouldn’t be doing that.'““Why is his face getting redder?” McEnroe joked.R. Diamond/WireImageThough little is known about their friendship, pictures of the two date back to 1991, two years before his first term as president. According toTheMiddletownPress, the sex therapist even encouraged Clinton, who was a governor at the time, to run for the presidency.In photos, their height difference is always a stand-out: Dr. Ruth is a mere 4′7” while the former president stands at 6′2”.Though the longtime friends appeared on screen for just a few seconds, internet users went wild about what they couldn’t possibly be talking about.“Bill Clinton and Dr Ruth sitting together at the#USOpenis a million times more entertaining than tennis,” a usertweeted.“The guest situation at the#USOpenis absolutely UNHINGED,“tweetedanother, hinting to another odd pairing in the audience: boxerMike Tysonsitting next to tennis player Martina Navratilova with a dog on her lap.A representative for Clinton did not immediately respond to PEOPLE’s request for comment.Chrystyna Czajkowski/AP PhotoClinton and Dr. Ruth were not the only celebrities in attendance. Queen Latifah, Spike Lee,Bella Hadidand other A-listers were also in the stands cheering for Williams.Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.The six-time US Open winner, wholast month announcedshe was “evolving away from tennis” dazzled a cheering sold outUS Open crowdbehind her every stroke as she defeated Montenegro’s Danka Kovinic, 6-3, 6-3.She will next face Anett Kontaveit of Estonia, the No. 2 seed, in the second round.

Serena Williams’last US Openis making for some memorable moments — both on and off the court.

During thetennis legend’s first gamein the tournament on Monday,former president Bill Clinton, 76, was in attendance with an unexpected guest:sex therapist Dr. Ruth Westheimer.

Throughout the game, theAsk Dr. Ruthstar, 94, and the politician talked plenty, often smiling, laughing and nodding at one another. At one point, Dr. Ruth appeared to give Clinton a playful slap on the face.

When the camera first panned to the duo, ESPN analyst and former tennis star John McEnroe asked, “Who knows what they’re talking about?”

Trying to understand their conversation, co-analyst and former tennis player Chris Evert said, “Look at these two, they’re really involved in some sort of … She’s giving him advice,” co-analyst Chris Evert said,The New York Postreported. “She just gave him advice. Yep, ‘You shouldn’t be doing that.'”

“Why is his face getting redder?” McEnroe joked.

R. Diamond/WireImage

Bill Clinton and Dr. Ruth

Though little is known about their friendship, pictures of the two date back to 1991, two years before his first term as president. According toTheMiddletownPress, the sex therapist even encouraged Clinton, who was a governor at the time, to run for the presidency.

In photos, their height difference is always a stand-out: Dr. Ruth is a mere 4′7” while the former president stands at 6′2”.

Though the longtime friends appeared on screen for just a few seconds, internet users went wild about what they couldn’t possibly be talking about.

“Bill Clinton and Dr Ruth sitting together at the#USOpenis a million times more entertaining than tennis,” a usertweeted.

“The guest situation at the#USOpenis absolutely UNHINGED,“tweetedanother, hinting to another odd pairing in the audience: boxerMike Tysonsitting next to tennis player Martina Navratilova with a dog on her lap.

A representative for Clinton did not immediately respond to PEOPLE’s request for comment.

Chrystyna Czajkowski/AP Photo

Democratic presidential hopeful, Arkansas Gov. Bill Clinton meets Dr. Ruth Westheimer Oct. 25,1991 a a New York Leadership Conference breakfast at New York’s Regency Hotel.

Clinton and Dr. Ruth were not the only celebrities in attendance. Queen Latifah, Spike Lee,Bella Hadidand other A-listers were also in the stands cheering for Williams.

Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.

The six-time US Open winner, wholast month announcedshe was “evolving away from tennis” dazzled a cheering sold outUS Open crowdbehind her every stroke as she defeated Montenegro’s Danka Kovinic, 6-3, 6-3.

She will next face Anett Kontaveit of Estonia, the No. 2 seed, in the second round.

source: people.com