Lady Gaga made one 10-year-old YouTube star's dreams come true last night during her concert -- when she invited the girl on stage to do a duet!

Maria Aragon became an Internet sensation when she posted a video of herself singing Gaga's "Born This Way" onto YouTube -- a video Gaga ended up tweeting with the message "Can't stop crying watching this. This is why I make music. She is the future."

During last night's Toronto concert, Gaga pulled Aragon on stage and told the crowd "I'm really excited Maria is here today because Maria represents what this song is all about. It's all about the next generation of the future" before the two started singing.

When the performance ended, Aragon told the audience "I just wanted to say I'm really grateful for all of you. i just want to thank all of you for all your support."

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Check out video and photos of the incredible duet!

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