The avid tennis fan was focused on the action during the men's final match between No. 1 Novak Djokovic and Stan Wawrinka.
The model stunned in a silky slip for the men's championship match.
Kloss's fellow "Bad Blood" star also took in the action at Arthur Ashe Stadium during the intense men's final.
The royal donned a watercolor-print frock to attend the U.S. Open championships on Sunday, Sept. 11.
The actress applauded the fierce competitors while stunning in a denim dress.
The fashionable businesswoman looked on-trend in an off-the-shoulder top.
The Honest Company founder made it a family day, taking daughters Honor and Haven to Day 13 of the Open.
Hilary Swank opts for a sleek and casual look on Day 13 of the Open.
Day 13 turned out to be model-studded including Turlington and Kurkova in the stands.
The model jazzes up her casual tank with blue and white printed pants.
Willis brings along his model wife Emma Heming to Day 12 of the Open.
The actress wore chic dark colors to attend Day 10 of the Open.
Bartha and Biggs bring their wives, while Hamm dons a cap, for the men's semifinals.
The model looked chic in matching palm-printed separates with her boyfriend, Vito Schnabel, to watch the women's semifinal matches.
The model smouldered in a crop top and denim cutoffs on day 11 of the championships.
The Orange Is the New Black star cheered on world No. 1 Serena Williams as she won her quarterfinal match.
The singer got a lesson in the game from none other than 1971 U.S. Open champion Stan Smith.
The veteran actors joined forces for a night of tennis, watching world No. 1 Novak Djokovic cruise through to the semifinals on Tuesday, Sept. 6.
The Queen spent her Labor Day at the U.S. Open, cheering on the Williams sisters in their back-to-back singles matches.
The actor cheered from his front-row seat alongside Anna Eberstein on Sunday, Sept. 4 at the Open.
The Ugly Betty star watched as Caroline Wozniacki took down American Madison Keys on day 7 at Arthur Ashe Stadium.
The stars cheered on Saturday, Sept. 3 at the U.S. Open in coordinating white looks.
The bearded actor got out of his seat for a stirring performance on the third day of the championships.
The Oscar winner watched Serena Williams cruise through her first round match on the second day of the tournament.
The House of Cards star saluted fans on the second day of the U.S. Open.
The expectant couple dressed up for the opening day of the 2016 championships.
The avid tennis fan was joined by former pro Martina Navratilova, looking chic in a red dress for day one.
Sarandon looked chic in all black to catch a night match on Monday, Aug. 29.
Leonardo DiCaprio
The avid tennis fan was focused on the action during the men's final match between No. 1 Novak Djokovic and Stan Wawrinka.
Mariska Hargitay
Kloss's fellow "Bad Blood" star also took in the action at Arthur Ashe Stadium during the intense men's final.
Princess Beatrice
The royal donned a watercolor-print frock to attend the U.S. Open championships on Sunday, Sept. 11.
Jessica Alba, Honor Warren, and Haven Warren
The Honest Company founder made it a family day, taking daughters Honor and Haven to Day 13 of the Open.
Christy Turlington, Ed Burns, and Karolina Kurkova
Day 13 turned out to be model-studded including Turlington and Kurkova in the stands.
Justin Bartha, Jon Hamm and Jason Biggs
Bartha and Biggs bring their wives, while Hamm dons a cap, for the men's semifinals.
Heidi Klum
The model looked chic in matching palm-printed separates with her boyfriend, Vito Schnabel, to watch the women's semifinal matches.
Emily Ratajkowski
The model smouldered in a crop top and denim cutoffs on day 11 of the championships.
Uzo Aduba
The Orange Is the New Black star cheered on world No. 1 Serena Williams as she won her quarterfinal match.
Pharrell Williams
The singer got a lesson in the game from none other than 1971 U.S. Open champion Stan Smith.
Ben Stiller and Hugh Jackman
The veteran actors joined forces for a night of tennis, watching world No. 1 Novak Djokovic cruise through to the semifinals on Tuesday, Sept. 6.
Queen Latifah
The Queen spent her Labor Day at the U.S. Open, cheering on the Williams sisters in their back-to-back singles matches.
Hugh Grant
The actor cheered from his front-row seat alongside Anna Eberstein on Sunday, Sept. 4 at the Open.
Vanessa Williams
The Ugly Betty star watched as Caroline Wozniacki took down American Madison Keys on day 7 at Arthur Ashe Stadium.
Kelly Rowland and La La Anthony
The stars cheered on Saturday, Sept. 3 at the U.S. Open in coordinating white looks.
Jonah Hill
The bearded actor got out of his seat for a stirring performance on the third day of the championships.
Lupita Nyong'o
The Oscar winner watched Serena Williams cruise through her first round match on the second day of the tournament.
Hilaria and Alec Baldwin
The expectant couple dressed up for the opening day of the 2016 championships.
Debra Messing
The avid tennis fan was joined by former pro Martina Navratilova, looking chic in a red dress for day one.
