Viewers thrilled Cat Deeley back on UK screens as the cheerful star sits in for Lorraine Kelly

Cat Deeley and Louise Redknapp are seen in throwback SM:TV Live clips during reunion on Lorraine

Cat Deeley on Lorraine today: ITV viewers divided as host fills in over half-term

Lorraine: Cat Deeley 'terrified' ahead of hosting Kelly's ITV show over the Easter break