In a video obtained by the Sun newspaper, Foden dances naked with topless strippers at the £77-a-head Barcelona nightspot Bagdad Sex Club earlier this month.
The video was captured by a fellow partygoer, who told the Sun: “Ben and three other lads were on a rotating stage with this topless girl in the middle.
“Another girl reached in and pulled down his jeans and boxer shorts. Ben waggled his crown jewels at everyone.
“There was a lot of laughter and cheering. In fairness I think he then maybe thought better of it and covered his parts up.”
The pictures of the rugby star are sure to shock his fiancée Una, 30. The singer has been with Ben, 26, for three years. Last month she gave birth to their daughter Aoife Belle.
The video has emerged just weeks ahead of their wedding.
Northampton Saints full-back Ben has not said anything on Twitter yet. After his trip to Spain, he tweeted: “Just back from my Stag in Barcelona with @tomfoden @geoheler and Co . . . Ooouucchhhh great couple of days but good to be home! #familytime”
Una has also remained silent.
After bad behaviour marred England’s 2011 World Cup, players were individually lectured by coach Stuart Lancaster about their behaviour off the field.