She sung versions of Pink's Get The Party Started and Avril Lavigne's Sk8er Boi.
All of the other students, who were evicted earlier in the week, were there to cheer the pair on.
Dobby
Earlier on, Pop Idol Gareth Gates failed his driving test for Comic Relief, along with loads of other celebs.
And EastEnders star Natalie Cassidy, who plays Sonia, and Big Brother star Jade Goody, failed their tests too.