It's not everyday that a street performer outside Faneuil Hall in Boston has the artist whose song she's performing in the crowd, but it happened Monday while John Legend checked out the sites of the city.

Legend was in town for his Orpheum Theater stop on his Bigger Love Tour and apparently chose to spend his day out and about in Boston with his wife Chrissy Teigen and their two children (nanny and bodyguards in tow, of course). While the crew was walking through Faneuil Hall, they heard something very familiar.

Singer Radha Rao was playing her keyboard and belting out Legend's "All of Me" for people passing by – and that's when the Legend family actually walked by. The perfect song at the perfect time led to Legend stopping to hear her sing and the approaching her to give what I hope was a big tip.

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Clearly he loved her performance and luckily someone in the crowd captured the really cool moment to share with the world on Facebook.

No doubt this is going to spark more street performers to consider which artists are playing locally when choosing their songs, though I'm sure this kind of once-in-a-lifetime timing for a young singer is extremely unusual. Still, it made for a very cool moment for both artists. The look on John Legend's face as she beautifully sings his song shows how much he appreciated coming across her singing the track while she obviously appreciated his stopping to hear it.

Speaking of Boston Singers, Check Out the Childhood Home of New Kids on the Block Members That Has Hit the Market

The Dorchester house where New Kids on the Block Jordan and Jonathan Knight grew up is currently posted as for sale for $1.8 million on Zillow, but be advised this house is a fixer-upper. You'll have to be "Hangin' Tough" and take the repairs "Step by Step," provided you've got "The Right Stuff" to renovate it.