Tony Bennett, 95, and his wife Susan Crow, 54, step out after his 'emotional' show with Lady Gaga at Radio City Music Hall in New York

Tony Bennett stepped out with his wife, Susan Crow, after an 'emotional' performance with Lady Gaga to celebrate his 95th birthday.

The legendary musician was spotted on a stroll with his wife in New York City ahead of the second night of performances at Radio City Music Hall.

Bennett, who revealed in February that he was diagnosed with Alzheimer's disease in 2016, was reportedly as 'charismatic as ever' during the One Last Time show on Wednesday night.

Bennett, who turned 95 on Tuesday, performed a 'roughly half-hour solo set' to the sold-out crowd at the famed venue, according to USA Today.

The Fly Me to the Moon crooner received a 'standing ovation after nearly every song,' with set-list highlights including Steppin' Out with My Baby and Last Night When We Were Young. 

His This Is All I Ask rendition was particularly 'emotional' as Bennett 'lingered on the ballad's haunting' lines: 'And let the music play as long as there's a song to sing / And I will stay younger than spring.'

Bennett stood by a piano positioned in the center of the stage and frequently signaled thumbs up and air kisses to the crowd.

The hour-and-a-half concert was taped for an upcoming TV special, where Gaga opened for Bennett and also served as his emcee.

She proved to be in lounge singer mode as she 'shimmied' on stage before joking about losing her wig while dancing. 

'So far, I've called Tony Bennett "Tony Benny," and my hair fell out. Things can only get better,' she said. 

In a rousing performance of New York, New York, Gaga rocked a top hat and encouraged the crowd to clap along with the song.

'Start spreading the news / it's Tony Bennett's birthday,' she sang. 'He's my friend. He's my musical companion. He's the greatest singer in the whole world.' 

The pair return to the famed New York City venue where they headlined a few shows in 2015, a year after they released their collaboration album Cheek to Cheek. They are slated to release a second collaboration later this year, Love for Sale. 

Gaga — who's full name is Stefani Joanne Angelina Germanotta — shared a throwback snap of Tony with the caption: 'Can't wait for our last show tonight Tony. The world loves you, and we're all so lucky to witness your gift, your generosity, and your joy tonight at Radio City.'