Since finishing second on Britain's Got Talent in 2009, her list of accolades includes scoring a trio of chart-topping albums, cracking America and signing up to guest star in a musical about her life next year.
With her latest LP Someone To Watch Over Me leading the chart this week, we caught up with her to find out who she's backing on this year's X Factor and what's next on her to-do list of ambitions.
You've just released your third album in three years. Do you still get nervous about putting out a new record?
"I do still get quite nervous because I'm never sure how my fans are going to react. I want people to like it and enjoy the music and there is always the worry that people won't or they'll get bored of you."
You've picked some interesting songs to cover in the LP including Depeche Mode and Joni Mitchell. How did you go about choosing them?
"Choosing the songs is the best part. I work with a great creative team and we all put suggestions into the pot. This year I wanted the album to appeal to more people and a younger generation so we came up with ideas that moved away from overtly religious themes and hymns."
Were there any songs you were particularly keen to have on the album?
"I am a huge fan of Joni Mitchell and Depeche Mode, so to be able to put my own stamp on classics was wonderful. We also used a lot of fan suggestions and looked at songs that reflected the fan mail that I had been sent. Fans had sent some really personal stories and the songs were chosen with this in mind. It takes you on a journey."
Rising star Emeli Sandé co-wrote 'This Will Be the Year'. Are you a fan of hers?
"I'm a huge fan of her work. I think she's hugely talented and one to watch. That girl is going to go far."
Your musical I Dreamed A Dream is coming out next year. How are rehearsals for your guest appearances going?
"It's going really well. I start rehearsals in the new year. Elaine is just wonderful and I think the whole production will do justice to my story as well as my family. I am very hands-on with the creative process and making sure that it is a truthful portrayal. I just hope people will enjoy it. I know I'm looking forward to working with a cast and being part of a big team and the camaraderie that it brings."
You've already collaborated with Peter Kay for charity; are there any artists in the charts today that you'd like to collaborate with on-record?
"That was so much fun. It was hard at times to keep a straight face especially as my hair got bigger and bigger. Peter was wonderful to work with."
"There are so many people I'd like to collaborate with. Lady GaGa, Michael Buble, Bruno Mars, Adele and Kings of Leon to name a few. I think they are such wonderful talents. I could see myself rocking it up a bit."
What do you think of this year's Britain's Got Talent stars Jai McDowell and Ronan Parke?
"They are very talented and I wish them all the best. As long as they keep themselves grounded and not let it get to their heads they will be fine. Jai as a fellow Scot has my full support and I'm on hand to give him all the advice he needs."
They're looking for a new judge this year. Would you consider a spot on the panel - perhaps a guest judge role?
"Ohh, I think I'd be a useless judge. I wouldn't be able to say no to anyone. I'd want to put all of them through. I don't think that's a future career path for me."
You were named the seventh most influential person on the planet last year. What would you most like to change about the world?
"Wow, well that is an honour! What would I want to change? Well, I'd like to make bullying illegal and make sure there were proper ramifications for people who engage in such inappropriate and harmful behaviour. They have no idea the long-term damage that they do, it can take years to get over and some never do."
Who are you backing to win this year's X Factor?
"I am watching the show this year - well, I'm having to Sky+ the show because I've been travelling so much. I'm supporting Amelia this year. I think she's great and I'm glad she is back in the show."
Do you think the show can survive without Simon Cowell?
"Well, it's different this year but it always was going to be. I wish they'd bring back Dannii Minogue. I thought she was a great judge."
You've done so much since you appeared on Britain's Got Talent; what is next on your list of ambitions?
"Next on my list of ambitions is to keep making albums and hopefully be able to do some Gala shows over in the USA. I'd love to do a show in Vegas - now that really would be fantastic."
Susan Boyle's new album Someone To Watch Over Me is out now.
Watch Boyle perform 'You Have to Be There' below: