The X Factor judge will be joined by singer VV Brown, TV presenter Lisa Snowdon, and Brazilian supermodel Ana Beatriz Barros.
Currently in South Africa filming the new campaign, Dannii is super-pleased with her new job and wrote on Twitter yesterday: 'I'm so excited to be a Marks & Spencer girl. On the beach shooting your spring campaign.'
But don't worry about Myleene Klass - she'll still be an integral part of M&S, focusing on different projects, including M&S Money and M&S Online TV.
Can't wait to see the new pics.
By Ruth Doherty