Rachel Riley has claimed an unnamed celebrity once filmed up her skirt before watching the footage right in front of her along with his mates.
The Countdown star revealed she was at the home of a friend at the time and had been playing table tennis with her husband Strictly star Pasha Kovalev.
The 36-year-old mentioned the incident while discussing the sexual harassment regularly received by her and other well-known women in the public eye.
She said: "One who shall remain nameless, who people would know, he just got an Apple Watch, and at a party at a friend's house, I was playing table tennis with Pash and this guy, in full view of everyone, came and put his phone on the floor under where I was standing.
"He then went and sat back down a couple of metres away, while him and all his mates looked at his watch."
She told the 'Dirty Mother Pukka' podcast today: "I wouldn't call him a friend, but you would know him. I was too polite.
"Now, being able to digest it and think about it, if someone tried to do that to me again I would break their phone.
"If they've got a problem with that, they can go to the police and we can deal with it in the public.
"That a man obviously thought he could get away with blatantly, brazenly putting his phone, upskirting me on a video for his friends on his phone, and it would be fine!
"Now I would just break his phone and deal with it afterwards.
"But at that time Pasha went up, picked his phone up, and politely went and took it to him, and just gave him a really awful look like 'what the hell are you doing?'
She said she was too polite to do anything at the time, but after years of trolling and harassment, she would deal with it very differently now.
"If someone tried to do that to me again, I would break their phone. If they’ve got a problem with that they can go to the police and we can deal with it in public."
Riley slammed social media giants for not stopping it and called on them to face the same controls as the normal media while hailing the forthcoming Online Harms Bill.
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