What happens, in today's world of selfies and social media, when you think your nephew looks just like a famous singer?

In the case of Rachel Ayanaw, you post a photo of your nephew on Twitter and then wait for the famous singer - nine-time Grammy winner John Legend - to respond with a photo of his own.

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Ayanaw, a 20-year-old from St. Louis, Mo., posted the photo of her brother's four-month-old son, Caden, on Twitter April 20.

My nephew looks like John Legend lol pic.twitter.com/BKCIMOuKop

- rahel (@_rahellla) April 20, 2014

"People have noticed his looks before and said something to my brother," Ayanaw told GoodMorningAmerica.com. "I took the picture earlier in the day and later on noticed that he looked particularly like him [Legend] in that picture so I just decided to tweet it."

The next day, Legend himself took to his own Twitter account to post a photo of himself as a baby, "for comparison's sake," he wrote.

My actual baby picture. For comparison's sake http://t.co/JliUA0Sy9r

- John Legend (@johnlegend) April 22, 2014

The result of the whole Twitter exchange is that Ayanaw was right all along. Her nephew does, in fact, look just like the "All of Me" singer.

"I was really shocked," Ayanaw said of hearing from Legend. "I didn't expect any of this to happen."

Legend, 35, has been married to model Chrissy Teigen, 28, since September. They have no children of their own for comparison's sake.