Billy Joel's three year-old daughter sings him 'Happy Birthday' on stage - and she is ADORABLE!

Last Thursday marked the Piano Man's 70th birthday!

And in celebration of his big milestone, Billy Joel got a pretty special birthday gift ...

Two of his daughters joined him onstage at Madison Square Garden in New York City to sing him 'Happy Birthday'.

After performing a duet of 'New York State of Mind' together, Joel's oldest daughter Alexa, 33, brought out his three-year-old daughter, Della Rose, with a mic in hand to sing the birthday tune.

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Understandably, the youngster seemed a little overwhelmed by the sight of 20,000 people in the crowd, so her big sister had to handle most of the song herself.

The legendary musician beamed with pride the entire time - and it is just the sweetest moment! 

After the adorable rendition, the Joel got off his piano chair and gave little Della Rose a kiss on her cheek.

Awwww!

Skip forward to the eight-minute mark to see Della Rose.