After receiving an email from Sam Smith, Lady Gaga sent a mysterious -- but heartfelt -- message to him last week, calling him "my baby" and complimenting his "voice of an angel." We already know that the British singer has a way with words, but what prompted such a public display of affection?

Well, when Smith talked with the people over at 103.3 AMP Radio in Boston, he revealed just what he said.

"Someone had mentioned to me that Gaga knew of my stuff," the singer said. "I was just completely overwhelmed by that. I wrote her an email basically just saying, 'I remember being a 17-year-old, queuing up for your concert, dreaming up doing this, and being in the music industry.'

"And the thing I admire most about Lady Gaga was the hustle and what she did to get into the industry. And I just ran with it saying, 'Thank you so much for inspiring me to do this because the reason why I'm here now is partly because of you.' And she seemed touched."