Nicola had her toe sucked by a woman dressed in head-to-toe fetish gear, as the trio enjoyed an evening of raunchiness at the city's Supperclub.
The singers also posed for a series of photos which they posted on Instagram, with Kimberley captioning the toe-sucking snap: "Only in Amsterdam! #toesuckage #happybirthdayginge."
They girls were not joined by their fellow bandmates Sarah Harding and Nadine Coyle - hardly surprising given Kimberley's recent revelations about them in her autobiography.
Cheryl and Nicola jetted out to Holland together on Friday ahead of the party, and were accused of arguing with airport staff after apparently missing their flight.
James Jones, a documentary filmmaker, claimed he saw Cheryl having a to-do at London's Heathrow airport - something which she has denied.
He tweeted: "Got bumped to Business Class for no apparent reason. Go into some strange lounge and Cheryl Cole is here having a row with staff. They missed their flight. The other Girl Aloud looks a bit embarrassed."
However, Cheryl soon tweeted: "Reading your tweets and me and Nic are ??!! Once again Nicola does the crime Cheryl does the time ! #somethingsneverchange."