Susan Boyle is to duet with an unknown American artist.

The 'Wild Horses' singer - who shot to fame after appearing on Simon Cowell's talent search show 'Britain's Got Talent' in 2009 - has announced mother-of-three Amber Stassi is the lucky winner of her YouTube competition 'Susan's Search', and the pair are now set to duet on Susan's forthcoming album 'The Gift'.

Susan said: "I really wanted to give someone the opportunity I had. Amber is a remarkable and talented lady and I am really looking forward to singing with her.

"I never thought so many people would want to take part in this and I want to thank everyone. It was very hard to choose a winner as there are so many talented singers around the world. Amber really stood out for me though. I enjoyed her audition clip very much, she has a lovely, very beautiful voice."

Susan - whose own audition for 'Britain's Got Talent' has now been viewed more than 500 million times on YouTube - called the winner yesterday (12.08.10) from her home in Scotland to notify her of her success.

Amber explained: "Never in my wildest dreams did I think I would win this competition. To receive this gift from Susan is truly a blessing. This is a chance to give my kids a good memory and maybe a chance at a better life.

"I can't believe I spoke with Susan - and that Susan and even Simon Cowell has seen my audition! This is crazy!"