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28 November 2011, 15:39 | Updated: 28 November 2011, 15:48
The singer has defended herself after her performance of new single 'Who You Are' was criticised.
Jessie J has stressed that she has "never mimed" after her performance on The X Factor last weekend came under fire.
Some Twitter users have complained about the 'Price Tag' star's vocal delivery of current single 'Who You Are' on Sunday's (28th November) show.
Responding to the criticism on Twitter, Jessie J acknowledged that the performance wasn't "perfect", but vehemently denied claims that she had mimed.
She wrote: "Its funny that people that follow you tweet you but don't @ you when there slagging you off.
"I WAS pitchy last night and its the first thing I said when I came off stage. The track was so low in my ears I couldn't hardly hear it. I am a realist and I'm NOT perfect.
"I'm growing and learning and I'd rate half the artists more if they had the guts to say sh*t to my face..."
In another post, she added: "There not even haters. They presumers. The pressure to be perfect 24:7 is unfair on ALL artists.
"I over sang at points yes I wasn't in tune the whole song yes and I'm confident to put that out there.
"Its important to know your qualities but also know where things can be improved. I don't wanna be an artist put in a bubble,but I will say this...To date I've never mimed or lip synced. That I'm proud of."
Jessie J is among the performers due to appear at this weekend's Capital FM Jingle Bell Ball, which takes place at London's O2 Arena on the 3rd and 4th December.