She said she was going to do it and true to her word, Jessie J has shaved off her glossy locks for Comic Relief.
The 'Price Tag' singer said having her hair shaved was the least she could do to help raise much needed cash for the charity.
She later took to Twitter to thank fans for their support, posting a snap of her new short do and tweeting: "I did it! Thank you to everyone who is donating! Please keep texting YES to 70010."
And we must say Jessie, it really does suit you!
Also appearing were One Direction, Miranda Hart, Ricky Gervais, Dawn French, James Corden, David Walliams, Simon Cowell and Hollywood star Will Ferrell.
Jessie waved bye-bye to her glossy locks as Red Nose Day celebrated its 25th anniversary.
Want to make a difference? Click here to donate to Comic Relief
Hosts on tonight's show included Rob Brydon, John Bishop, Davina McCall, Nick Grimshaw, Jonathan Ross and Russell Brand.
Other highlights of the evening saw Ricky Gervais resurrecting David Brent for a brief revival of 'The Office' and Rowan Atkinson addressing the nation as the new Archbishop of Canterbury, sharing his views on the importance of fundraising for 'Red Nose in Need'.