Heidi Pratt performed for the first time on Sunday's Miss Universe pageant.
She sang "Body Language" while dancing around in a sequin bra and matching pants. Half her song was blocked out while NBC, which broadcast the performance from The Bahamas, introduced the 15 finalists.
"I think people don't know what to expect, and how can they? It's my first performance live and it's in front of a billion eyes. So I'm very excited to show everyone what I'm coming with," Montag told the Associated Press just before performing.
TMZ.com reported that Montag would lipsync because producers were nervous about her performance and couldn't remember her lyrics.
Pratt, though, said she was unaware of the criticism and eager to take the stage.
"I'm very excited for everybody to see this," she said. "I think a lot of people are expecting something very different."