The magazine, which splashed a picture of mother and baby on its front cover, said Yeater's lawyers had filed a lawsuit on Monday.
"While we haven't yet seen the lawsuit, it's sad that someone would fabricate, malicious, defamatory and demonstrably false claims," said a statement by Bieber's publicist.
"We will vigorously pursue all available legal remedies to defend and protect Justin against these allegations," it added.
On Twitter, Beiber said: "so Im going to ignore the rumors...and focus on what is real. an opportunity to help by doing what i love. Judge me on the music! Love yall!"
He put out a flurry of tweets about his just-released charity Christmas recording "Under the Mistletoe" -- "So Let's Get this Album to #1 and all make a change for the better" -- but did not confirm or deny the paternity talk.
The Canadian-born heartthrob soared to stardom after videos of his performances were posted on YouTube, with his album "My World 2.0" hitting the top of the US charts in 2010.
His music video "Baby" is one of the most-watched clips ever posted on YouTube, with more than 640 million viewers.
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"While we haven't yet seen the lawsuit, it's sad that someone would fabricate, malicious, defamatory and demonstrably false claims," said a statement by Bieber's publicist.
"We will vigorously pursue all available legal remedies to defend and protect Justin against these allegations," it added.
On Twitter, Beiber said: "so Im going to ignore the rumors...and focus on what is real. an opportunity to help by doing what i love. Judge me on the music! Love yall!"
He put out a flurry of tweets about his just-released charity Christmas recording "Under the Mistletoe" -- "So Let's Get this Album to #1 and all make a change for the better" -- but did not confirm or deny the paternity talk.
The Canadian-born heartthrob soared to stardom after videos of his performances were posted on YouTube, with his album "My World 2.0" hitting the top of the US charts in 2010.
His music video "Baby" is one of the most-watched clips ever posted on YouTube, with more than 640 million viewers.
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