UPDATE: You can read Britney's Twitter response here.

Radar Online is offering exclusive audio of what is purportedly a conversation between pop princess Britney Spears and her husband for one day Jason Alexander (not the Seinfeld actor; different guy).

In it, “Britney” says that current boyfriend Jason Trawick has been beating her. In one memorable moment, the woman on the tape says her father has a “shotgun … and he’s just waiting to use it.”

Waiting for what? In any event, Alexander talked about this and much more with Star magazine, saying that Britney’s life has “turned into a nightmare."

But the Spears camp says no way. They are categorically denying the audio clip, telling TMZ it is “so obviously fake as to be laughable.”

“Suffice it to say, Jason Trawick has never laid a hand on Britney [Spears],” they said in a prepared statement.

Alexander, however, is standing behind his story. “That is absolutely my ex wife Britney Spears on that tape,” he told Star magazine, who reports that Alexander underwent a polygraph test to verify the validity of his claims. “I grew up with her since I was in 4th grade and I know what she sounds like. She has been calling me for years.”

Star says that Alexander passed the polygraph.

Radar Online has recently released a second clip of the alleged phone conversation. The Spears team has stated that they will be taking legal action against the “defamatory” story.