In an exclusive talk with NBC News' Meredith Vieira, singing sensation Susan Boyle opens her heart in the first interview since she became a star on “Britain’s Got Talent.”

“It’s just been unbelievable; it’s indescribable,” Boyle says to Vieira of her incredible transformation.

“Being plucked from obscurity is a bit like going on a long journey, really; you don’t know what’s going to happen. You don’t know how it’s going to end.

“I don't want it to end,” she adds with a hopeful smile. “It’s just really good.”

Boyle sports a new hairstyle in the interview — a change that drew a rave from the stylish Vieira.

Thanking her with her typical self-deprecating humor, Boyle jokes: “I brush up quite well.”

The exclusive interview will air on the "Today" show with an extended interview as part of a special edition of  “America’s Got Talent” on Wed., July 22, which also includes the last round of competitions before the quarterfinals.

Earlier this year, Boyle shocked the world with her incredible, head-turning rendition of "I Dreamed a Dream" from the Broadway show "Les Miserables" on "Britain's Got Talent."

She went on to sing Andrew Lloyd Webber's "Memories," the signature song from his blockbuster, "Cats."

The Scottish native, both of whose parents were Irish and lived in Donegal, said she was inspired to enter "Britain's Got Talent" after her mother's death in 2007.

She said he was too shy to sing in front of such a big audience but that her mother had urged her to enter.

She then found the courage to perform after visiting the Shrine of Our Lady of Knock in County Mayo.

"I wanted to show I could do something with my life," she humbly said at the time.

But after her surprising second-place finish to dance troupe Diversity, and questions about her health, she has not spoken about her experiences to anyone until now.

Boyle will talk to Vieira about her amazing  journey to international fame, her health and what's next for her — which IrishCentral has learned is likely to be a Christmas album.

Boyle has joined forces with Ossie Kilkenny, who will look after her financial affairs as she prepares to take the world by storm.

The 62-year-old Irish accountant, who was instrumental in building U2's financial empire, has also worked with the likes of Van Morrison, Oasis Bjork and the Verve.

The two held a meeting - which was organized by Susan’s niece, London entertainment lawyer Kirsty Foy - in May when Kilkenny went to Boyle’s hometown of Blackburn to meet the singer and her family.

The 48-year-old singer now has the dream team of Simon Cowell to release her record and Kilkenny to manage her finances as she embarks on her singing career.

A source close to Syco records, Cowell’s label, told the Mirror newspaper that Boyle and Kilkenny met again on Friday.

“Susan wants to work with Simon, but she and her family have also chosen to bring in Ossie Kilkenny as manager. So the record will be with Simon’s label, but Ossie will look after her management.”