Watching celebs watching sports is the best sport.
1. Extremely supportive friend Gigi Hadid returned to watch her pal Serena Williams play again:
2. Meghan Markle (aka the Duchess of Sussex) was also in attendance to support Serena...
3. ...and she greeted Serena's husband, Alexis Ohanian, with a hug:
4. Look how hype she is for her friend! I love it!
5. Cara Delevingne and Ashley Benson looked adorable in the crowd...
6. ...and even snuck in a few kisses:
7. Alessandra Ambrosio watched the match with so much focus:
8. Irina Shayk shayked her fists during the men's final...
9. ...and Karlie Kloss klossed her arms. (I'm done with the puns, I swear!)
10. Uma Thurman and her son, Levon, enjoyed a fun mother–son outing:
11. Peter Hermann and Mariska Hargitay had the ultimate date night:
12. Lindsey Vonn and her fiancé, hockey player P.K. Subban, did too:
13. Paul Bettany (famous tennis actor of Wimbledon fame) and Jennifer Connelly were shook by the match:
14. Anna Wintour gazed off into the distance!
15. Trevor Noah looked stressed!
16. And, finally, Michael Douglas and Catherine Zeta-Jones enjoyed the match. Catherine appeared to be attempting to catch a tennis ball...
17. ...and Michael was all about taking a selfie:
18. "Hey, Catherine, come look at my selfie!"
And that's a wrap on US Open 2019! See you next year!