Jessie J Dyes Shaved Head Blonde On 25th Birthday

A little over a week ago, Jessie J shaved her head in support of Comic Relief, and now the British pop star has dyed blonde what hair has grown back.

"It's my birthday and I'll be blonde if I want to," she wrote on Twitter by way of commemorating her 25th birthday, along with a pic of the new doo.

"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," she later added on the social network.

On March 15, Jessie shaved her head live on television, subsequently raising over $750,000 for the U.K.'s Red Nose Day.

The event's organizers, in a post to their website, applauded the efforts of those who participated, remarking on a successful day of fundraising:

"Thanks to the public's enormous generosity, Red Nose Day 2013 has raised 75,107,851 so far, which we'll now put to work transforming lives across the UK and Africa."

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