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Jessie J, who scored a top 25 hit with her debut single Do It Like A Dude, says the song was originally written for Rihanna.

The Essex singer said: "I'm really honest about that. I decided to keep it for myself."

She confirmed the track, released last month, was written with the Barbadian in mind, but "fortunately she didn't hear it."

Jessie J will release her debut album Who You Are in 2011.

Introducing... Jessie J

The 22-year-old singer and songwriter has written for Alicia Keys before, also penned Miley Cyrus's worldwide hit Party In The USA.

She launched the first episode of her online TV series Jessie J Dares this week.

It features behind-the-scenes footage of the singer along with celebrities setting her challenges.

"I think it's hilarious," said J, speaking to Newsbeat at MTV's Brand New for 2011 event. "I watched it and I hadn't actually seen the finished version.

"In the first episode you've seen me in a gorilla suit, with no make-up on - I look about ten because my eyelashes are blonde so I look like I've got an awful wig on - you just see me, being me.

In the first episode she received a 'dare' set for her by N-Dubz.

"I've done about four dares," she explained. "The Perez Hilton dare - am I allowed to let you in on that? He made me go into the caves where Batman used to go in the original TV show. Go in there and sing a song.

"I put my own twist on it and dressed up as Batgirl.

"I've got B.o.B on there, N-Dubz, Perez Hilton, there are a few other sneakies… I want to get my Nan to do one, and my old headmaster."