The model, who is married to England footballer Peter Crouch, has called in police after discovering the intimate photos were being circulated.
Clancy, who recently moved back to Cheshire after Crouch's £10m transfer from Tottenham to Stoke, believes someone she knows took the images from her phone's memory card, according to The Sun.
"This is disgusting," a source said. "The thought of somebody else being able to get their grubby hands on these pictures is upsetting and embarrassing.
"Abbey has had a stressful few weeks. Moving house is hard work at the best of times, but she has a 6-month-old baby to keep her busy too.
"Having a breach of trust like this is the last thing she needs. She is determined to find out what has gone on and make sure the person responsible is dealt with appropriately."
A spokesman for Clancy last night insisted she is taking the situation "very seriously".
The couple welcomed their first child Sophia Ruby back in March.