The BBC Radio 1 DJ asked fans to donate to her Red Nose Day fundraising page to hit the target before March 15.
"I'm going to reduce my dwindling sex factor by wearing a full chicken suit for a month to all work and events IF I raise £50,000 for Red Nose Day 2013 to change lives both here in the UK and in Africa," she wrote.
"And that's where you come in. If you sponsor me, you'll be helping to make the world of difference."
She subsequently posted on Twitter: "Bear in mind I have some huge event's I'm supposed to be doing in March, which I'm supposed to be glammed up for.
"[It] dramatically lessens my chances of pulling. I won't leave the house without the thing. So I'm giving up love for charity...
"I will wear the chicken suit 15th march- 15th april. (so essentially I wont get laid 15th march-15th april) Donate!"
This year's Comic Relief highlights include Jessie J shaving her head on live TV, a concert featuring Noel Gallagher, Nicole Scherzinger and Emeli Sandé, and a sketch believed to involve Simon Cowell getting married.
Celebrities pose for Red Nose Day - photo gallery:
Copyright: Jon Cottam