Jessie J, Amber Rose
SPOT THE DIFFERENCE: Jessie J(L) appears to have taken inspiration from Wiz Khalifa\'s fiancée Amber Rose(R) for her new hairstyle.

It all started as a charity challenge to raise money for Comic Relief, but it seems that Jessie J is embracing her new close-shaven head.

The singer, who turns 25 today, has unveiled her newly coloured mane.

Appearing to take inspiration from Wiz Khalifa's model fiancé Amber Rose, the Price tag hit maker has dyed what little hair she has left blonde.

Ahead of her birthday celebrations she shared a snap of her revamped buzz with fans on Instagram, and wrote: "It's my birthday and I'll be blonde if I want to."

The Who You Are star is reportedly spending her milestone birthday on 'holiday' with a group of girlfriends.

"I have no signal where I am so I'm hoping this sends!! Thank you in advance for all the birthday tweets and messages!!! I feel so happy right now!!! I'm 25!!! Waahhh!!! #birthdaymadness," to told her 6.8million followers on Twitter.

She later added: "Birthday fun!!! :) "@LeticiaCornish: OMFG!!!!! BLONDE *-* Perfect @JessieJ. Happy birthday!"

Jessie insisted that she felt liberated after shaving her head bald live on air as part of Red Nose Day celebrations for Comic Relief on March 15.

The Voice coach raised over £500,000 for charity after vowing to chop off her dark, thick hair last September.

"This programme started when I was born," she explained. "I wanted to shock people. I wanted to do something that wasn't going to last five minutes and it's fun."