Strictly Come Dancing professional Kai Widdrington will not be performing in this weekend's live show, it has been announced. The star is partnered with Delta Goodrem, who herself had to miss a week earlier in the series due to an injury.Stepping in to cover him is Aljaž Škorjanec, who'll team up with Delta for one week only as she competes for a coveted spot in the annual Blackpool special.A statement reads: "Due to illness, Kai is unable to dance on tomorrow night's show.