Pictures from the X-rated bash emerged on Instagram over the weekend, where the flame-haired singer can be seen having her toe-sucked by a erotic performer, while pals Cheryl Cole and Kimberley Walsh looked on.
When asked by Digital Spy if she had managed to visit the Dutch capital for the celebrations, Harding replied: "No, not my scene darling."
Despite Sarah's absence, Kimberley went on to tell the website that herself, Nicola and Chezza had a "really good time".
Speaking at the Pride of Britain Awards last night (October 7), Walsh revealed: "It was fun, as you probably saw from our tweetfest. The toe-sucking was not voluntary, I need to put that out there. While in Amsterdam!
"We had a really good time, we celebrated in style. We partied until the early hours of the morning, which we don't do very often. While we've all got a bit more time to breathe it's nice to actually go out and have fun."
Cole and Nicola were snapped arriving back in London yesterday, with both girls wearing huge sunglasses.