Lady Gaga kept her promise to ten year old Maria Aragon who recently covered 'Born This Way' and has since become a YouTube phenomenon. 

Aragon, from Winnipeg in Canada, recently caught the pop superstar's attention after her beautiful rendition of the single notched up over 17 million views. Upon hearing the cover, Gaga declared that they must sing together at some point during her 'Monster Ball' tour. 

Last night, March 3, the 'Just Dance' singer performed in Toronto and kept her word to Aragon, who came out on stage to sit on Gaga's lap and sing a duet with her. Watch the full clip below: