New York, New York - Madonna made sure that her daughter Mercy's 18th birthday was something very special by throwing a party not at home, but at Madison Square Garden!

During her Celebration World Tour show on Monday, the 65-year-old superstar Madonna not only gave her daughter Mercy a great birthday surprise but also delighted her fans.

The pop icon asked her daughter, who was seated in the front row, to stand up and show herself to the audience.

Somewhat taken aback by her mother's big shoutout, Mercy stood a few seconds later and was handed a lit candle, which she blew out to loud cheers from the fans.

Rihanna Rihanna stirs up new marriage rumors with massive diamond ring!

"Look at this queen!" Madonna said as she cheered for her birthday girl.

Afterward, Mercy was serenaded by her mother and the audience with Happy Birthday, as reported by PEOPLE. The pop duo then performed Bad Girl together for the delighted crowd, with Mercy accompanying her mother live on the piano.

Along with the concert tribute, Madonna paid homage to her daughter with a moving message shared via Instagram.

"Beautiful Mercy James. You're already a young woman! Beautiful African Queen!! You Surprised all of us!" the Vogue singer wrote under a montage of the pair's memories together.

In addition to snapshots in the recording studio, eating in a restaurant, or by the sea, the birthday girl was also seen several times making music on the piano and on stage.

"Always Humble and Kind. Always the first one to say thank you. To clear the table after dinner! To Come and Hug me and say how much you appreciate something. And Always the most [Responsible]," Madonna continued in the lengthy message.

Mercy, whose real name is Chfifundo James, was born in Malawi and adopted by the singer in 2009.