Justin Bieber Tweets to Paternity Accuser

Justin Bieber spent the weekend shooting a sexy music video with a gorgeous model who's a dead ringer for girlfriend, Selena Gomez.

But it isn't Bieber's new video that fans are talking about today. The internet is buzzing about a bizarre tweet Bieber just sent, the same day he was shooting his music video.

The tweet was directed at Mariah Yeater, the woman who filed a paternity suit against Bieber last year, claiming he was the father of her baby. He adamantly denied her claim and she later withdrew the lawsuit.

Bieber tweeted: "Dear Mariah Yeater, we have never met...so from the heart I just wanted to say..."

And then he attached a link with an audio clip from the movie Borat, where the main character says, "You'll never get this! You'll never get this!"

Bieber also tweeted 25 other bizarre messages over the weekend, including:

"I discovered Matt Damon."

Then a few minutes later.

"Rick James is my grandfather."

The string of nonsense had some fans worried. One fan tweeted: "@justinbieber what is wrong with you are you drunk?"

Another wrote: "@justinbieber is definitely high right now."

Meanwhile, INSIDE EDITION spoke exclusively with the man who says he is the real father of Mariah Yeater's baby. His name is Robbie Powell and we recently caught up with him in prison near San Diego where he was serving time on burglary and drug charges.

INSIDE EDITION's Jim Moret asked, "Is there any question that you're the father of that baby?'

"I knew I was the father," said Powell.

Powell says he tried to talk his girlfriend out of filing the paternity claim against Bieber.

"I told her, 'Don't do it, you're stupid.' She said she'd make enough money to support our son for the rest of our lives," said Powell.