Madonna and Mercy James on July 11, 2017 in Blantyre, Malawi.Photo:AMOS GUMULIRA/AFP via Getty

Madonna (L) hugs her Malawian adopted daughter Mercy James

AMOS GUMULIRA/AFP via Getty

Madonnais celebrating her fourth child’s birthday with a touching tribute.

The “Vogue” singer, 65, shared aphoto montageof her daughter Chifundo “Mercy” James for her 18th birthday on Monday. The sweet montage was set to background music of Mercy gracefully playing a rendition of Erik Satie’s “Gnossienne No. 1” on the piano.

“Beautiful Chifundo James! you’re 18 yrs old today!! Beautiful Mercy James. You’re already a young woman! Beautiful African Queen!! You Surprised all of us! ♥️🇲🇼♥️🇲🇼♥️🇲🇼♥️🇲🇼,” the “Material Girl” singer began her birthday message in the Instagram caption.

Madonna went on to share how Mercy has been the “quiet,” “gentle,” “shy” and “stoic” sibling and “never” wanted “to draw attention” to herself.

Madonna and Mercy James.Madonna/Instagram

Madonna and Mercy James

Madonna/Instagram

“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,” Madonna continued. “And Always the most Responsible.”

Madonna next praised Mercy’s musical abilities. “That hand that was once frozen in your mouth as a child -now makes magic happen when you play the piano," she wrote. “Whether it’s Erik Satie or Chilly Gonzales. To hear you play Chopin every night in my show with such confidence is such a thrill.”

She then applauded Mercy’s talents behind a camera.

“Nothing gives me greater pleasure than to watch you grow. You really are A wonder,” Madonna wrote of her daughter. “Wishing You the happiest of Birthdays! The happiest of everything— because you deserve it.”

“Even though we both hate shellfish the world is your Oyster !! She is waiting for you to devour it. To eat it whole!!! To Slay it!! 🌍🌎🌏💙💙💙,” concluded the singer.

Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.

Madonna is also mom to twinsEstere and Stella, 11,David Banda, 17,Rocco, 23, with ex-husbandGuy Ritchie, andLourdes Leon, 27, with ex Carlos Leon.

Mercy was born in Malawi on Jan. 22, 2006. After Madonna’s divorce from Ritchie was finalized in 2008, sheapplied to adopt Mercyas a single mother in May 2009 and was approved the next month.

Madonna and Lourdes, Estere, Stella, Rocco, David Banda, and Mercy.Madonna Instagram

Madonna and her kids

In 2017, Madonnaappeared on the cover of PEOPLEand opened up about her life at home with her children and her emotional adoption journey.

“Sometimes I would just close my eyes and just think, ‘Why isn’t my kitchen filled with dancing children?’ There’s so many children that need a home,” shesaid. “I thought, ‘What am I waiting for? Just do it.'”

source: people.com