As the weather cools down, the tennis court heats up at Billie Jean King National Tennis Center.
That's right: The 2017 U.S. Open kicked off in late August, and the stars poured into New York to watch some of the best names in tennis face off in Arthur Ashe stadium.
The festivities officially kicked off on Monday, Aug. 28, as celebrities flocked to the 17th annual USTA Foundation Opening Night Gala at the USTA Billie Jean King National Tennis Center in Queens. Shania Twain (who also happened to be celebrating her 52nd birthday) performed for an eclectic group, including Pharrell Williams, Luke Bryan, and Katie Couric.
Since the tournament started, celebs from Victoria Beckham and her son Romeo to Leonardo DiCaprio have been spotted in the stands. But perhaps the cutest little tennis fan we've seen yet is Olivia Wilde and Jason Sudeikis's 3-year-old son Otis, who took in the action at Arthur Ashe stadium while mom and dad chatted with James Franco.
VIDEO: Trust Us, We Tried It: US Open Ball Girl
Scroll down for all the stars at the 2017 U.S. Open.
Ben Affleck and Lindsay Shookus
The new couple turned the U.S. Open into a date night as they watched Rafael Nadal win the 2017 men's singles championship.
Jerry and Jessica Seinfeld
The power couple enjoyed a day out to watch the final match of the tournament on Sunday.
Julianna Margulies and Keith Lieberthal
The Good Wife star and her husband cuddled up during the men's semifinals.
Katie Holmes
The actress, who was spotted holding hands with Jamie Foxx over Labor Day Weekend, cheered on the women's semifinalists at the U.S. Open on Thursday night.
Olivia Wilde, Jason and Otis Sudeikis, and James Franco
The star couple brought their son, Otis, to take in the action alongside actor James Franco.
Justin Timberlake and Jessica Biel
The cute couple shared a smooch while taking in the action on Arthur Ashe on Sept. 2.
