Presenters Phillip Schofield and Holly Willoughby apologised to the viewers at home when the 'Call the Midwife' actor made the slip-up.
The judge, who announced he was leaving the show last year, does not hold back on his other former workmates either
Phillip Schofield and Holly Willoughby were also criticised on social media for taking a photo with the Prime Minister.
The former One Direction star has previously admitted that embarking on a solo career left him feeling 'lonely' and 'erratic'.
The 'This Morning' host said of the 'Strictly Come Dancing' presenter's eye make-up brand, "I wouldn't know who Claudia was."
The 53-year-old TV and radio presenter was showing Phillip Schofield and Holly Wiloughby the results of his varicose vein surgery.