Her husband believed the baby was his and that it had been conceived during the honeymoon but his wife confessed to the infidelity after he repeatedly questioned doctors as to how the baby could have been born with dwarfism.
The woman has not been named, but according to local reports she felt compelled to tell her husband after questions were raised by friends who had accompanied her on the hens night, which took place at the beginning of the year.
Spanish website LasCincoDelDia, which broke the news, said: "Neither her closest female friends or her family knew she had sex with the midget stripper but once she had her son in her arms, she broke down and confessed what had happened.
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"As you can imagine no-one that sleeps with a stripper at her hen night broadcasts it or at least they try to take their secret to the grave.
"But the protagonist of this episode had no choice but to confess and could never have pretended the boy was her husband's because of a little problem - the child was born with dwarfism."
It is not unusual for dwarfs to be hired as entertainers at hens and bucks parties in Spain and several websites offer the services of "miniboys" as they are known in Spain.
The Telegraph, London