Jessie J turned 25 today and the Price Tag singer, who recently shaved her head bald as part of Red Nose Day celebrations for Comic Relief UK, gave a glimpse of her newly coloured hair.

"I have no signal where I am so I'm hoping this sends!! ☺ Thank you im advance for all the birthday tweets and messages!!! I feel so happy right now!!! I'm 25!!! Waahhh!!! #birthdaymadness," she wrote, later adding "Birthday fun!!! :) "@LeticiaCornish: OMFG!!!!! BLONDE *-* Perfect @JessieJ. Happy birthday!"

"HappyBirthdayJessieJ" has been trending on Twitter, with Jessie J fans showering her with birthday wishes.

"@emmalongworth1 #HappyBirthdayJessieJ hope you have an amazing 25th birthday I'm so proud of you and can't wait to see you in June Love you loads@JessieJ"

"@opeyemi_iam Roses are red, Other stuff is grey. But much more importantly, #HappyBirthdayJessieJ!""

"@LucijaGolubic I really hope #HappyBirthdayJessieJ stays up there for all day long!! We better keep it up #heartbeats ;) such an amazing fanbase! Love yall"

"@RossHeartbeatJJ #HappyBirthdayJessieJ it's top on the goddamn trends worldwide #BirthdaySexForJessieJ"

"@BreeSenz #HappyBirthdayJessieJ I Wish You the best Darling, I Hope U have a great time with all the people u love. 'Love You♥ "

Meanwhile, the Voice UK coach recently criticised the swivel chairs on the show, claiming that they are unsuitable for girls.

"Honestly, as a girl, it's not the most comfortable chair," she told to the Radio Times, "While all the guys can sit back and look relaxed, I either have to sit really upright and forward, or lean to the side. I feel so little in that chair, but at least my feet touch the ground... Will's don't!"

She also hit back on the claims that she acts like a diva back stage after she reportedly snubbed the boss of BBC One when he wanted to congratulate her on the show's ratings.

"I don't think there's ever been any show on TV where a girl hasn't had the diva stamp. I see it as some sort of compliment because the original divas were the Shirley Basseys, the Whitney Houstons," she said, "I would never ever want anyone to think that's how I am. Because I'm not. I'm the complete opposite. I have eight people in my team - not 50, which is what was said in the papers. But you can't win... I've realised that it happens to women."

The new series of The Voice is set to begin on 30 March, on BBC 1.