Ant and Dec - and 90s SMTV Live - fans have been left shocked after seeing a throwback clip resurface.
Dec, 45, made an X-rated joke about S Club 7's Rachel Stevens on the live show, despite it being aimed at kids.
The Geordie duo made saucy comments about their celebrity guests and in a throwback video shared on TikTok, the pair, alongside Cat Deeley, show the best moments of the series.
Cat says: "Our number four moment is the pottery wheel with Rachel.
"The lads always, always get very excited if Rachel or S Club 7 ever come on the show, she's known as 'the lovely Rachel' and is one of our closest friends.
"This is one moment that I know in particular sticks with Declan."
Dec can be seen moaning quietly to himself while Cat was presenting, but he then says to his co-stars: "I've got a stiffy now."
Cat mouth's drops open in shock and the studio audience burst into hysterics.
The video was captioned: "What does Dec say!" alongside a crying with laughter emoji, and viewers were shocked by what they heard on the clip.
Flocking to the comment section, one fan said: "No way did he say that on SM:TV!"
Another wrote: "Not sure he'd be allowed to say that on TV these days."
A third added: "I always thought Dec was the sweet and innocent one out of the two."
One more exclaimed: "How did he get away with that!"
Last month, Ant and Dec reunited with Cat, now 42, to take a trip down memory lane.
They looked back at their time on the breakfast show which aired on ITV more than 20 years ago.
Cat previously confessed that the three of them bawled their eyes out when they toured the studio in which the set had been rebuilt for the special.
She said: "We all cried. I walked in and they were doing their interview and Dec was crying and I was like: 'Ok, you’re crying!'
"And then at the end of my interview I was like: 'Waaah!'."