The singer, who used to be in the famous British girlband with Beckham's wife Victoria, has claimed that it makes her feel uncomfortable to see her friend's husband flaunting his new H&M underwear range.
"When you see David in his pants quite a lot, you think, 'That's my friend's husband, and I really don't want to see him in his pants,'" the Daily Mail quotes Chisholm as saying.
"Brand Beckham is huge and they've worked so hard at building that huge empire.
Great, but there is a negative side to that. I see it all the time, the endless public fascination with them."
Meanwhile, the former England captain is yet to decide whether he will remain at PSG beyond his current contract that runs out in the summer.