The Saturdays singer posted a photo of herself on Instagram this morning sporting a cute Pudsie onesie.
Rochelle looked hugely excited as she posed in the cosy hoodie, which even has spotty ears just like the real CiN bear mascot.
She captioned the photo "Today is the day @bbccin", making it clear that she couldn't be more prepared for her role tonight.
Rochelle is joining regular CiN presenters Sir Terry Wogan, Tess Daly, Fearne Cotton and Nick Grimshaw on the appeal show tonight, which will feature highlights including One Direction performing on the EastEnders set and the long-awaited reunion of S Club 7.
It looks like Rochelle is set to have a great time presenting the show but we hope she has time to answer a very pressing question first - where can we get our hands on one of those snuggly onesies?!