Acid reflux disease caused Ashlee Simpson's vocal cords to swell

That is what her dad said. And THAT is why she used pre-recorded vocals.

Um, what?

Hasn't she ever heard of chewing some Tums?

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Ashlee Simpson's embarrassing performance on Saturday Night Live didn't hurt her sense of humor.

The 20-year-old singer and reality TV star took to the stage for Monday night's Radio Music Awards at the Aladdin hotel in Las Vegas to perform " Autobiography," the song that had caused her so much consternation on SNL just a couple nights earlier. Before she began, host Carson Daly assured the audience they were getting a live version of the song, but as the track began Simpson screamed, " It's the wrong song," the Associated Press reports.

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 A second later she added that she was " only kidding!" – and then performed the song live.

The self-deprecating moment may have put a lid on Saturday's flub, during which Simpson walked off the SNL stage when her band began playing the wrong song and a prerecorded vocal track was clearly playing.

On Monday her father, Joe Simpson, blamed the lip-synching incident on his daughter's acid reflux disease, which he said had swollen Ashlee's vocal cords. The elder Simpson said it was his decision to go ahead with the prerecorded tracks, Reuters reports. " You've got to do what you've got to do," he said.