Lady Gaga surprised fans at a New York City jazz club on Tuesday (26Jul16) by staging an impromptu performance.

The pop superstar was among the patrons at the Gramercy Park Hotel's Rose Bar, where her jazz musician pal Brian Newman was playing, when she decided to crash the stage and take over the microphone.

Joining forces with Brian and fellow artist Tommy London, frontman of The Dirty Pearls, Gaga belted out six songs during her 30-minute set, which included renditions of jazz standards I Can't Give You Anything But Love, and Bang Bang, and Edith Piaf's signature song, La Vie en rose.

She also encouraged the excited audience to sing along for Just a Gigolo, reports the New York Post's Page Six column.

"She bantered a lot with the crowd," a source revealed. "She was talking about the value of friendship and how much she enjoys playing music with her friends."

According to TMZ.com, Gaga even showed off her rhythm on the drums, much to the crowd's delight, before spending the rest of the night sipping cocktails and mingling with the audience.

The singer is no stranger to Rose Bar customers as she has previously performed there with Brian unannounced on numerous occasions. She was also recently named the godmother to Brian's newborn daughter, Sistilia.

The surprise gig marked Gaga's return to the stage since confirming her split from her actor fiance Taylor Kinney last week (ends22Jul16).

The singer's first official performance following the break-up is set to take place at the Camden Rising concert in New Jersey on Thursday (28Jul16), when rocker Lenny Kravitz and DJ Jazzy Jeff will also play.

The show, organised as part of the Democratic National Convention (DNC), will take place just hours before former Secretary of State Hillary Clinton formally accepts the Democratic Party nomination for president in Philadelphia.