Guest judge Katy Perry helps Simon Cowell, Cheryl Cole and Louis Walsh select the best solo singers and groups in Dublin as the auditions move to Louis's native Republic of Ireland for the first time since 2006.
Guest judge Katy Perry helps Simon Cowell, Cheryl Cole and Louis Walsh select the best solo singers and groups in Dublin as the auditions move to Louis's native Republic of Ireland for the first time since 2006.
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