The stars have joined 17 other celebrities, including Alexandra Burke and Mollie King, in the 'Show You Care With The Lindt Bear' fundraising campaign.
The chocolate company is aiming to raise £100,000 over five weeks by auctioning the limited edition gold bears on Lindt's Facebook page. Four bears will be added each week to the auction site, with all of the proceeds going to the children's charity.
Jessie J said: "The 'Show You Care With The Lindt Bear' campaign is a great way to raise money for BBC Children in Need, it's a great charity.
"I was so happy to be able to be involved to help raise funds. Make sure you go online and get bidding! And eat lots of chocolate!"
Other stars to join the cause include Sir Tom Jones, Emilia Fox, Roger Federer, Emma Bunton and Amanda Holden.
Lindt has also said that it will donate £25,000 to Children in Need upon reaching 25,000 Facebook shares.