The Biebers are serving.

Justin and wife Hailey Bieber were spotted attending the US Open as they supported 19-year-old Coco Gauff take on Belgium’s Elise Mertens in round three of the championships Friday night.

The Grammy winner, 29, was seen donning a funky hat and pair of glasses for the outing, as well as a pair of blue jeans paired with a white vest.

Meanwhile, Hailey, 26, looked chic in a black leather jacket which she paired with a white tank and gold statement earrings.

The couple, who have been married since 2018, appeared in good spirits as they watched Gauff keep her dream of a first grand slam alive by beating Mertens 3-6 6-3 6-0 at Arthur Ashe Stadium.

The pair were seen jumping for joy after tense rallies, and even got a special shout-out from Gauff after the match.

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Justin Bieber blows kisses to a fan while at the US Open tennis championships on Friday.JASON SZENES FOR THE NEW YORK POST

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The couple poses as they are put up on the stadium’s screen.JASON SZENES FOR THE NEW YORK POST
“I was definitely starstruck with Justin Bieber,” the Atlanta-born athlete said to the crowd. “‘Never Say Never’ was one of my favorite songs when I was a kid. And then ‘Baby, Oh Baby’… I could go through all his songs. And then Hailey coming too — I guess it was a little date night for them which is really cool.”

“He was pumped. I love it,” Gauff later posted on Instragram, accompanying a photo of the cheering Justin.

The couple sat in a box alongside tennis star Frances Tiafoe, who played at Louis Armstrong Stadium earlier in the night, and Miami Heat star Jimmy Butler.

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Frances Tiafoe chats with Bieber in a luxury box as the Coco Gauff match is being played.JASON SZENES FOR THE NEW YORK POST

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The couple attended the event after Hailey’s successful skincare brand Rhode’s had a launch in NYC.JASON SZENES FOR THE NEW YORK POST
“Jimmy Butler has come to a couple of my matches so I wasn’t as surprised that he was there. But I’m still like: ‘This guy is busy. Why is he coming to watch me play?!’ But it’s a really cool experience,” she said.

The 19-year-old also gushed over the crowd in New York, saying, “The energy today definitely helped me. I felt you guys. I played every point my hardest.”

The Bieber’s sporty outing comes just days after the pair LA-based couple enjoyed a boat trip in the Hamptons.

The pair seemed loved up as they indulged in some fishing activities during a quiet afternoon on the water.

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The love birds appeared in good spirits as they watched Gauff keep her dream of a first grand slam alive at Arthur Ashe Stadium.JASON SZENES
Their day out followed on the heels of Hailey celebrating her successful skincare brand Rhode’s latest launch in NYC.

The pair appeared to make headlines for the wrong reasons as fans were quick to point out that Stephen Baldwin’s daughter was dressed far more formally than Justin at the flashy event.

Justin’s model wife donned a skintight little red dress, while the “Yummy” hitmaker opted for a pair of gray shorts paired with a grey hoodie zip-up, yellow crocs, and a pink hat.

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Coco Gauff reacts after she defeats Elise Mertens of Belgium, during the third round of the U.S. Open tennis championships, Friday, Sept. 01, 2023, in New YorkJason Szenes for the New York Post
While her whirlwind trip to NYC was a success, fans pointed out an embarrassing error on the Rhode Instagram.

After a fan inquired whether the company ships to Alaska, a customer service rep accidentally responded that they are working to service more countries — despite the fact that Alaska is in the United States.

The pair’s NYC visit comes just two weeks ahead of their five-year wedding anniversary on September 13.