Lady Gaga attended Tony Bennett‘s 90th birthday celebration in New York City Wednesday night in a glamorous black dress.

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Gaga arrived at Manhattan’s Rainbow Room for Bennett’s birthday party last night in a black Brandon Maxwell dress. Gaga completed her look with Brian Atwood platform heels and diamond earrings and a matching bracelet.

“Thank you @brandonmaxwell for this beautiful dress,” Gaga wrote. “I got that “First Lady” style! (When your best friend designed a dress for FLOTUS and u bring it up to him 50 times a day cuz ure so proud ?).”

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Sarah Nicole Tanno did Gaga’s dramatic makeup for the the evening, while Frederic Aspiras styled the singer’s platinum blond hair.

Gaga was more than happy to help Bennett ring in his 90th birthday. On Instagram Gaga captioned a picture with the legendary crooner, “I am so honored to be by Tony’s side on his 90th birthday. Today we lit up the Empire State Building together, in the colors of the Italian Flag to commemorate Bennett’s legacy as the greatest living legend & example of the Italian American Dream. We love you “Ton'” Happy Birthday! 90 is the new 20!”

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Gaga also shared a picture of herself with Bennett, Stevie Wonder and Paul McCartney. Gaga wrote, “What a beautiful night with beautiful friends. We love you Tony you’re the apple of our eyes. You’re the best there is! #happy90thtonybennett ??”

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At one point during the festivities, Gaga sat down for an impromptu performance with Wonder. Gaga posted a picture with Wonder, and shared, “He is the kindest most generous soul. I said what key we doin’ it in man F, F#? He goes. ‘I’ll find you, girl.'”

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