Lady Gaga parties with fiance Michael Polansky in NYC after suffering a respiratory illness last week

Lady Gaga and fiancé Michael Polansky partied at Maison Nur in New York City after her final Mayhem Ball Tour show on Monday night.

The 40-year-old pop star wrapped the international tour, which started in July, with a show at Madison Square Garden.

The restaurant is set at the corner of Rivington Street and Bowery in downtown, where Gaga – born Stefani Germanotta – famously cut her teeth as a budding pop act.

According to Page Six, one witness described Monday night's celebration as the star's 'return to the Lower East Side.'

'Their vibe is just really good. His influence on everything is really affable. He’s not just some man hanging out or walking behind her. He’s her partner in the truest sense,' said a source about the future husband and wife.

Guests included Maggie Gyllenhaal and Dylan Mulvaney, plus musicians and Lady Gaga collaborators Brian Newman and Breedlove.

Gaga's mom Cynthia Germanotta was also in attendance, as well as the singer's close childhood friends.

One friend told the outlet about the Mayhem tour, 'This show was literally the most fun I’ve seen her have on stage.'

An insider described the end of the show as 'bittersweet,' adding, 'It’s sad for the era to come to an end, and to walk into a party that signifies the end, but now [Gaga] can say, "I did it. It’s in the can, history was made."

Last week the music artist was forced to cancel a Montreal concert just three hours before its scheduled start time.

She took to her Instagram Story to explain that she was 'unable to perform' as she had been 'fighting a respiratory infection.'

She said that her doctor 'strongly advised' her not to perform as her illness had 'gotten worse.'

Gaga said she was 'absolutely heartbroken' about not being able to take the stage until she recovered and apologized to her fans.

At the time of publication, she did not share information about rescheduling or refunding ticket holders.

She'd previously performed two shows in the city.

Gaga has been engaged to Polansky since 2024, and she revealed in March that they will tie the knot 'soon.'

She teased the detail about her upcoming wedding while calling in to Bruno Mars's Romantic Radio TikTok Live.

'Me and my fiancé have been traveling all year, but we’re getting married soon. We were hoping you could choose a special song for us,' Gaga said in a recorded message.

The couple was first romantically linked around New Year's Eve 2019 and went Instagram official in early 2020.

Polansky is a 2006 graduate of Harvard University and is the executive director of Parker Foundation.

Gaga won two Grammys this year – one for Best Pop Vocal Album and another for Best Pop Dance Recording for her smash hit Abracadabra.

During one acceptance speech, she declared her love for her fiancé and credited him with helping her create her latest album.