Upset that her fiance's family appeared to prefer his former girlfriend, Siti Nurazlin Samat, 28, hatched a plot to get her into trouble.

She got hold of her telephone number, pretended to be a male police officer and struck up an intimate online relationship with the 24-year-old - who was a co-curriculum programme executive at a school - using fake e-mail and Facebook accounts.

Sometime in May 2011, the woman sent Siti Nurazlin 10 naked pictures of herself.

In December that year, Siti Nurazlin, claiming to be a concerned parent, sent a typewritten letter with four of the pictures to the principal of the secondary school where the victim worked. She lied that she had "found" the lewd photographs in the pages of her "son's" mathematics book and said that the school executive had handed him the pictures herself. She insinuated that there may have been incidents of sexual abuse or inappropriate behaviour within the school. The woman - a non-teaching member of the staff - was dismissed.

Siti Nurazlin, a remote equipment specialist at port operator PSA Singapore, pleaded guilty on Monday to providing false information to a public servant. She will be sentenced on Aug 20 as her lawyer requested for time to prepare the mitigation plea.

The incident came to light after the victim reported to police in January last year that an unknown person had been circulating naked pictures of her. Investigations then revealed Siti Nurazlin's involvement.

The district court ordered that no particulars that could lead to the victim's identity be published.