Madonna watched her daughter, Lourdes Leon, star in her school's version of 'Grease' last night (06.12.13).

The 'Girl Gone Wild' hitmaker attempted to keep a low profile as she attended LaGuardia High School in New York City with her other children, Rocco, David and Mercy to cheer on the 17-year-old fashion designer as she played Betty Rizzo in the iconic musical.

An eyewitness told UsMagazine.com that Lourdes won rave reviews for her performance: ''[She was] really good. The show was completely sold out, and people were scalping tickets beforehand.''

The insider added: ''She is a great singer, dancer and actress and seemed completely comfortable on the stage. She also seemed like she was having a lot of fun with the part.''

Lourdes thanked her mother and father, Carlos Leon, in the event's program.

It states: ''Lola Leon (Betty Rizzo) is a senior Drama major at LaGuardia and this is her second annual musical. Last year she performed the role of Elaine in 'Sweet Charity' at LaGuardia and is very grateful to be able to participate in such an elaborate production for the second year in a row. Previous work in musical theatre before that include ensemble roles in 'Hair' and 'Cabaret' at ArtsEd in London.

''She would like to thank her parents with all of her heart for giving her guidance and love and supporting her passions wholeheartedly.''

Lourdes will perform as Rizzo, the role originally played by Stockard Channing in the 1973 movie, in the show again tomorrow night (08.12.13).