Lady GaGa was ''touched'' when Sam Smith thanked her for inspiring him.

The 'Alejandro' hitmaker recently praised the ''special'' singer as having the ''voice of an angel'' and admitted an email he sent her had made her cry, and Sam has now explained what he said in his note to her.

He told 103.3 AMP Radio in Boston: ''Someone had mentioned to me that Gaga knew of my stuff. ''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.''

In her tweet to the 'Stay with Me' singer, Gaga hailed him as ''perfect''.

She wrote: ''You're so special my baby. Your email made me cry @samsmithworld With the voice of an angel, u need no permission or advice. You're perfect.(sic)''