Countdown presenter, 36, opened up about the incident for the first time during a new podcast interview. Setting the scene, the mum-of-two explained how she and her former Strictly Come Dancing professional dancer other half had been playing ping pong at the time.
The male celebrity, who Riley said would “remain nameless,” but that “people would know”, was at the party showing off his new Apple Watch.
He then walked over while the couple were playing and put his phone on the floor under her skirt, “in full view of everyone”.
When he returned to his seat just a couple of metres away, his friends all gathered around to look at his watch. Speaking on the Dirty Mother Pukka podcast, Riley said: "It was like a video basically, so he went and put his phone down so he could look up my skirt and went two metres away where we could see what he was doing to go and look at his phone look up my skirt. "Riley said that her reaction at the time was “too polite” and if it happened again, she would have responded differently.
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