Question: Which co-host of the broadcast event of "Children in Need 2015" is best known for her work in pop groups S Club 8 and The Saturdays?
Sentence (from "Children in Need 2015"): The broadcast was hosted by Dermot O'Leary with Tess Daly, Fearne Cotton, Rochelle Humes and Nick Grimshaw as co-hosts.
Relevant evidence: Yes