Miss Rhode Island representative Olivia Culpo took home the first place crown earlier this month.
After the pageant, Miss Philadelphia Sheena Monnin renounced her title in protest at the pageant, alleging that producers of the show had fixed the final result.
Chairman Donald Trump slammed Monnin's allegations, and has since launched a lawsuit against her for breach of contract and defamation.
However, Fox News now reports that a new contestant has anonymously stepped forward, corroborating Monnin's story that Miss Florida Karina Brez saw a secret document that held the names of the top five finalists before they were announced.
"I saw Florida backstage and she was very, very flustered and upset," the anonymous woman explained. "I thought it might be because she didn't make the top 15 cut, but at that point she was able to reveal to me at least four of the five names who went on to be the top girls."
The unnamed competitor went on to claim that other girls in the competition are aware of the alleged fix, adding: "[Brez] couldn't remember the fifth because she was so upset. Several of the girls then started hearing through the grapevine about a list; a lot of people were upset."
Trump and the Miss Universe Organisation, which owns the Miss USA pageant, have continued to deny claims of a rigged contest, while several contestants are also saying that Monnin's story is untrue.
Bosses have yet to respond to these new allegations.