Lady Gaga made an impromptu appearance for a small crowd at the Black Rabbit Rose in Hollywood on Thursday night in which she sang a bunch of Frank Sinatra songs. "I’m here to ruin the party, " Gaga joked. "I’m so sorry."

According to Entertainment Tonight, the singer opened her set with Call Me Irresponsible before segueing into Fly Me To The Moon. Gaga customarily performs both these numbers as part of her back-to-basics jazz residency gigs in Las Vegas.

"My whole life, you know, I’ve been called irresponsible," she told the audience before her first song at the Black Rabbit Rose. "It doesn’t make me so mad because it’s kind of true… and I like to hear the truth."

 The Black Rabbit shows are organised each Thursday night by Limp Bizkit’s Fred Durst.

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The singer recently revealed that she has been slipping into cinemas to take a closer look at her film A Star Is Born.

"I’m squatted in the back with the popcorn, like, hiding and then I sneak (out) 30 minutes out because the end of the movie is so sad that I can’t take it," she told Jimmy Kimmel Live in February. "So I’m just, like, crying with my popcorn."

The extrovert singer recently laughed off reports that she was expecting a baby.

Lady Gaga