The Essex musician has been tipped for the top after being named BBC Sound of 2011, allowing her to join an illustrious list of winners that includes 50 Cent, Ellie Goulding, Keane and Corinne Bailey Rae.
Using tips from 160 key critics, bloggers and broadcasters, the contest seeks to showcase the best rising music stars for the coming year.
Jessie J - real name Jessica Cornish - has already achieved success after co-writing Miley Cyrus' Party in the USA.
She also made it into the UK top 30 with her debut single Do It Like A Dude, which was released on Island Records.
'It feels amazing to be accepted on such a broad scale,' the artist told BBC News.
'I know I'm doing something right and I've got to keep doing it. It's an honour.'
Runners-up in the contest included The Vaccines, James Blake, Jamie Woon and Clare Maguire.
2003 winner 50 Cent went on to become a massive music star, before branching out into film work and computer games.
Jessie J Jokes About Dudes
Jessie J wrote her debut single 'Do It Like A Dude' as ''a joke song'' in reaction to the bling heavy videos she was seeing on TV at the time.
The fast rising pop singer - who has previously penned hits for Miley Cyrus, Alicia Keyes, and Chris Borwn - said she wrote her first release in 15 minutes as a reaction to the songs she kept hearing on the TV at the time.
She said: "At the time I felt that the chart was very auto-tune heavy. There was a lot of guys with their trousers down by their knees and their neck chains so heavy they couldn't hold their head up.
"And I just went into the studio and they played a beat and I just started singing, 'Do it like a brother, do it like a dude'.
"And it was a joke, I was laughing. I said 'let's write a joke song'. And within 15 minutes it was done."
Jessie, the openly gay 22 year old, also said she kept Rihanna in mind when she wrote the track, and feels that it has "her swag".
She added: "Rihanna's 'Rude Boy' was out and I thought, 'It just has her swag all over it, let's write for her.' It was one of those songs that was supposed to be fun. I don't take myself seriously at all."
'Do It Like A Dude' is out now.
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