Miss World Singapore (MWS) 2013 finalist Vanessa Tan has been accused of being a freelancer on sex forums such as Sammyboy.
Freelancer is a commonly used label for a freelance prostitute.
Pictures resembling Miss Tan, but with her face either digitised or cut off, were featured in at least one online advertisement for a freelancer named Felicia.
A netizen also claimed on online forums that he had paid Miss Tan for sex through an agent.
The 19-year-old freelance model-dancer has now challenged the netizen to come forward to back up his allegation.
Prominent criminal lawyer Subhas Anandan, who happens to be a judge at this year's pageant, said Miss Tan is considering taking legal action against the netizen.
He said that she stands a high chance of winning the case. The 17 MWS 2013 finalists met the media at a press conference on Monday at the Pan Pacific Singapore hotel.
When asked about the allegation, Miss Tan said: "When my friend showed me the screen grab of the netizen who claimed he had sex with me, I was not shocked. There will always be people who want to bring you down.
"I want this guy to show himself and show me proof that I had sex with him. Come face me if you dare."
As for the pictures used in Felicia's online posts, Miss Tan said: "Sure, the pictures used are mine, but they were stolen from me."
According to the post, Felicia is a 1.55m tall, 20-year-old Chinese woman who weighs 40kg and has a tattoo.
The advertisement also states what services she is willing to provide to her clients. A mobile phone number was included in the earlier posts but missing in later ones.
All the posts have been deleted from the forums.
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Photos:(TNPS,NP, Miss Singapore World)
I wonder singapore pagent conducts for what? In terms of looks, we lose to the giant countries.