Terrell Owens
Not to be confused with the Australian Open or the French Open, the former NFL star is pointing out the official logo of the 136th US Open.
Jon Hamm
Trading in the fedora for a casual cap, this Mad Men star is looking suave as ever!
Ivanka Trump
The businesswoman took a break from work and the upcoming election to watch some tennis.
Hilary Swank
The two-time Oscar winner was turning heads at the games, looking ravishing in tennis-appropriate white.
Sienna Miller
It's all in the details! A red lip, effortless ponytail and light brown bag complete the Burnt star's style.
Jessica Alba
The heat wasn't going to stop this entrepreneur and actress from rocking a sophisticated all-black look.
Bruce Willis & Emma Heming
This Hollywood couple came prepared with sun protection: Bruce is rocking a light beige Panama hat, while wife Emma is sporting Ray-Ban shades.
Allyson Felix
Is it just a coincidence this six-time Olympic gold medalist chose to wear a gold dress? We think not.
Debra Messing
The lady in red! The Will & Grace star and proud mommy brought the heat to an already sweltering weekend!
Peter Sarsgaard
No shave... September? The Green Lantern star is wearing his hair long nowadays and rocking a scruffy new beard.
Tony Bennett
The American singer who soared in both the jazz and pop circles enjoyed himself from the stands
Stan Smith & Pharrell Williams
Who wouldn't be "Happy" standing next to a former world No. 1 American tennis player and two-time Grand Slam singles champion?!
Pharrell Williams
The "Happy" singer is taking the competition seriously.
Hugh Jackman
The Aussie tweeted that he had a "sensational night" on Day 6.
Ben Stiller
The actor, taking in the action with wife Christine Taylor, looks as intense as the pros.
Shaquille O'Neal
The NBA legend waves to the crowd on Day 6.
Hugh Grant
The Golden Globe winner was all smiles watching from the stands alongside partner, Anna Eberstein.
Uzo Aduba
The Orange Is the New Black star didn't't let the sun stop her from watching the game! The 35-year-old famous for playing "Crazy Eyes" shielded her namesake with slick shades.
Michael Strahan
The retired football player enjoyed his weekend before his big arrival as Good Morning America's newest co-anchor.
Jay Z & Beyoncé
The "Crazy in Love" collaborators watched their friend Serena Williams defeat Vania King 6 to 3 on Day 3. "I looked up and was like, 'Oh s--t! Beyoncé is watching,'" King told ESPN after the match.
Vanessa Williams
The actress poses on the blue carpet before watching Lucas Pouille win his match.
Ashley Graham
Days before New York Fashion Week kicks off, the model spent her Sunday at the USTA Billie Jean King National Tennis Center.
Odell Beckham Jr.
Sometimes, it's nice to watch from the stands than on the field.
Lupita Nyong'o
The Oscar winner came to support Serena Williams on Day 2. "Simply The Best, live," Nyong'o wrote on Instaram. "Crossed another off the bucket list."