Jessie J just completed the ultimate "Hair Dare" -- by going completely bald!

The "Price Tag" singer, who usually wears short wigs in public, just clipped off all her hair live on BBC1 as part of today's big Red Nose Day for Comic Relief in the UK.

And she looks great, like a glam Sinead O'Connor.

"Shaving my head is the smallest thing that I could do to give back to these people that need it so much," she said in a video about her decision to go bald.

Watch the big reveal below:

The money raised by the stunt will help a number of charities in both the UK and around the world, including victims of sex trafficking, mental health, domestic abuse and those affected by HIV and AIDS.

For more information on how you can help, check out the official Comic Relief website.

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