Celebrities at 2019 U.S. Open: Katie Couric, Regina King, Alec Baldwin and more

It's just the beginning of the 2019 U.S. Open and tons of famous faces have already been spotted in the crowd cheering on their favorite tennis pros.

Gigi Hadid came out to the Billie Jean King Tennis Center to support her good friend Serena Williams. The supermodel stunned in a Canadian tuxedo and suede Louboutin booties with Missoma jewelry. Hilaria and Alec Baldwin attended the tennis tournament on opening day, as did Spike Lee and legendary soul singer Gladys Knight.

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Gigi Hadid cheers on Serena Williams at the 2019 US Open
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Gigi Hadid cheers on Serena Williams at the 2019 US Open
NON-EXCLUSIVE Aug 28, 2019 - Gigi Hadid cheers on BFF Serena Williams at the 2019 US Open on August 26, 2019 in New York City. Photo credit: Jackson Lee
NON-EXCLUSIVE Aug 28, 2019 - Gigi Hadid cheers on BFF Serena Williams at the 2019 US Open on August 26, 2019 in New York City. Photo credit: Jackson Lee
NON-EXCLUSIVE Aug 28, 2019 - Gigi Hadid cheers on BFF Serena Williams at the 2019 US Open on August 26, 2019 in New York City. Photo credit: Jackson Lee
Gigi Hadid watches the Serena Williams vs Catherine McNally match at the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 28, 2019 in New York City. (Photo by Gotham/GC Images)
Gigi Hadid watches the Serena Williams vs Catherine McNally match at the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 28, 2019 in New York City. (Photo by Gotham/GC Images)
NON-EXCLUSIVE Aug 28, 2019 - Gigi Hadid cheers on BFF Serena Williams at the 2019 US Open on August 26, 2019 in New York City. Photo credit: Jackson Lee
NON-EXCLUSIVE Aug 28, 2019 - Gigi Hadid cheers on BFF Serena Williams at the 2019 US Open on August 26, 2019 in New York City. Photo credit: Jackson Lee
NON-EXCLUSIVE Aug 28, 2019 - Gigi Hadid cheers on BFF Serena Williams at the 2019 US Open on August 26, 2019 in New York City. Photo credit: Jackson Lee
Gigi Hadid watches the Serena Williams vs Catherine McNally match at the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 28, 2019 in New York City. (Photo by Gotham/GC Images)
Gigi Hadid watches the Serena Williams vs Catherine McNally match at the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 28, 2019 in New York City. (Photo by Gotham/GC Images)
Gigi Hadid watches the Serena Williams vs Catherine McNally match at the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 28, 2019 in New York City. (Photo by Gotham/GC Images)
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Oscar-winning actress, Regina King, visited the Tennis Channel suit looking sporty in a Ellesse sweatsuit while Queen Latifah watched Novak Djokovic rally it out during the men's singles second round.

From Katie Couric to "Stranger Things" star Natalia Dyer, check out all of celebrities who got their game faces on at the U.S. Open this year.

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Celebrities at 2019 U.S. Open
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Celebrities at 2019 U.S. Open
NEW YORK, NEW YORK - SEPTEMBER 02: Golfer Tiger Woods with his children Sam and Charlie and two companions, watch Rafael Nadal of Spain play against Marin Cilic of Croatia on Arthur Ashe Stadium at the USTA Billie Jean King National Tennis Center on September 02, 2019 in New York City. (Photo by TPN/Getty Images)
NEW YORK, NEW YORK - SEPTEMBER 02: Golfer Tiger Woods with his children Sam and Charlie and two companions, watch Rafael Nadal of Spain play against Marin Cilic of Croatia on Arthur Ashe Stadium at the USTA Billie Jean King National Tennis Center on September 02, 2019 in New York City. (Photo by TPN/Getty Images)
NEW YORK, NEW YORK - AUGUST 28: Gigi Hadid watches Serena Williams of the United States and Catherine Mcnally of the United States during their Women's Singles second round match on day three of the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 28, 2019 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Katharine Lotze/2019 Getty Images)
NEW YORK, NEW YORK - AUGUST 26: John Molner and Katie Couric attend the Women's Singles first round match between Maria Sharapova of Russia and Serena Williams of the United States during day one of the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 26, 2019 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)
Regina King visits Tennis Channel's suite on Day 1 of the 2019 US Open.
Jim Parsons visits Tennis Channel's suite on Day 1 of the 2019 US Open.
NEW YORK, NEW YORK - AUGUST 26: Hilaria and Alec Baldwin attend the Women's Singles first round match between Maria Sharapova of Russia and Serena Williams of the United States during day one of the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 26, 2019 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)
NEW YORK, NEW YORK - AUGUST 28: Queen Latifah (R) attends the Men's Singles second round match between Novak Djokovic of Serbia and Juan Ignacio Londero of Argentina on day three of the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 28, 2019 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Katharine Lotze/Getty Images)
NEW YORK, NEW YORK - AUGUST 26: Robin Roberts attends USTA 19th Annual Opening Night Gala Blue Carpet at USTA Billie Jean King National Tennis Center on August 26, 2019 in New York City. (Photo by John Lamparski/Getty Images)
NEW YORK, NEW YORK - SEPTEMBER 02: Golfer Tiger Woods with his children Sam and Charlie and two companions, watch Rafael Nadal of Spain play against Marin Cilic of Croatia on Arthur Ashe Stadium at the USTA Billie Jean King National Tennis Center on September 02, 2019 in New York City. (Photo by TPN/Getty Images)
NEW YORK, NEW YORK - AUGUST 26: Ex-boxer and celebrity Mike Tyson watches Serena Williams of the United States play against Maria Sharapova of Russia on court 17 in the first round of the US Open in Arthur Ashe Stadium at the USTA Billie Jean King National Tennis Center on August 26, 2019 in New York City. (Photo by TPN/Getty )
NEW YORK, NEW YORK - AUGUST 26: Film Director Spike Lee watches Serena Williams of the United States play against Maria Sharapova of Russia on court 17 in the first round of the US Open in Arthur Ashe Stadium at the USTA Billie Jean King National Tennis Center on August 26, 2019 in New York City. (Photo by TPN/Getty )
NEW YORK, NEW YORK - AUGUST 26: Legendary soul singer Gladys Knight of Gladys Knight and the pips acknowledges the crowd as she is featured on the main scoreboard between games, while watching Novak Djokovic of Serbia play against Roberto Carballes Baena of Spain in the first round of the US Open at the USTA Billie Jean King National Tennis Center on August 26, 2019 in New York City. (Photo by TPN/Getty Images)
NEW YORK, NEW YORK - AUGUST 26: Emilia Bechrakis Serhant and Ryan Serhant attend USTA 19th Annual Opening Night Gala Blue Carpet at USTA Billie Jean King National Tennis Center on August 26, 2019 in New York City. (Photo by John Lamparski/Getty Images)
NEW YORK, NEW YORK - AUGUST 26: Rita Moreno attends USTA 19th Annual Opening Night Gala Blue Carpet at USTA Billie Jean King National Tennis Center on August 26, 2019 in New York City. (Photo by John Lamparski/Getty Images)
NEW YORK, NEW YORK - AUGUST 26: Natalia Dyer attends USTA 19th Annual Opening Night Gala Blue Carpet at USTA Billie Jean King National Tennis Center on August 26, 2019 in New York City. (Photo by John Lamparski/Getty Images)
NEW YORK, NEW YORK - AUGUST 26: Maxwell (L), Former professional football player Tiki Barber, designer Vera Wang, Josephine Becker and Cheryl Scharf attend the Women's Singles first round match between Maria Sharapova of Russia and Serena Williams of the United States during day one of the 2019 US Open at the USTA Billie Jean King National Tennis Center on August 26, 2019 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)
NEW YORK, NEW YORK - AUGUST 26: Danielle Brooks attends USTA 19th Annual Opening Night Gala Blue Carpet at USTA Billie Jean King National Tennis Center on August 26, 2019 in New York City. (Photo by John Lamparski/Getty Images)
NEW YORK, NEW YORK - AUGUST 22: Jill Zarin and Gary Brody attend the Citi Taste Of Tennis on August 22, 2019 in New York City. (Photo by Noam Galai/Getty Images for AYS Sports Marketing)
NEW YORK, NEW YORK - AUGUST 26: Daymond John attends USTA 19th Annual Opening Night Gala Blue Carpet at USTA Billie Jean King National Tennis Center on August 26, 2019 in New York City. (Photo by John Lamparski/Getty Images)
NEW YORK, NEW YORK - AUGUST 26: Designer Vera Wang attends USTA 19th Annual Opening Night Gala Blue Carpet at USTA Billie Jean King National Tennis Center on August 26, 2019 in New York City. (Photo by John Lamparski/Getty Images)
NEW YORK, NEW YORK - AUGUST 24: Singer/songwriter Austin Mahone performs during Arthur Ashe Kids' Day at USTA Billie Jean King National Tennis Center on August 24, 2019 in New York City. (Photo by Gary Gershoff/Getty Images)
NEW YORK, NEW YORK - AUGUST 22: (L-R) Serena Williams, Rafael Nadal and Venus Williams attend the 2019 Palace Invitational at Lotte New York Palace on August 22, 2019 in New York City. (Photo by Jamie McCarthy/Getty Images for Lotte New York Palace)
2019 US Open Tennis Tournament- Day Three. Serena Williams of the United States in action against Catherine McNally of the United States in the Women's Singles Round Two match on Arthur Ashe Stadium at the 2019 US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on August 27th, 2019 in Flushing, Queens, New York City. (Photo by Tim Clayton/Corbis via Getty Images)
2019 US Open Tennis Tournament- Day Three. Venus Williams of the United States during her match against Elina Svitolina of the Ukraine in the Women's Singles Round Two match on Louis Armstrong Stadium at the 2019 US Open Tennis Tournament at the USTA Billie Jean King National Tennis Center on August 27th, 2019 in Flushing, Queens, New York City. (Photo by Tim Clayton/Corbis via Getty Images)
Former San Francisco 49er's quarterback Colin Kaepernick watches the Women's Singles match of Naomi Osaka and Magda Linette during their Round 2 women's Singles match at the 2019 US Open at the USTA Billie Jean King National Tennis Center in New York on August 29, 2019. (Photo by Kena Betancur / AFP) (Photo credit should read KENA BETANCUR/AFP/Getty Images)
Brazilian model Adriana Lima watches the Round Three Men's Singles tennis match between Novak Djokovic of Serbia and Denis Kudla of the US from Djokovic's players box during the 2019 US Open at the USTA Billie Jean King National Tennis Center in New York on August 30, 2019 (Photo by Don EMMERT / AFP) (Photo credit should read DON EMMERT/AFP/Getty Images)
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