• Justin Bieber and Lara Stone

Justin Bieber and Lara Stone (Photo : http://www.dailymail.co.uk/)

Following Justin Bieber's reveal as a new Calvin Klein model, "Beliebers" have posted death threats against co-model Lara Stone, who posed with the Canadian pop-star intimately in the underwear brand's ad campaign.

According to Daily Mail, a Twitter user by the name of @ameliebelieber6 posted a tweet, saying that she will "kill that girl," referring to Stone.

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Meanwhile, another Twitter user threatened Stone that she will kill her if she ever touches Bieber's private parts "again." The user said that she was not joking.

Little did the Beliebers, a name that die-hard Bieber fans call themselves, know that Stone has been married to "Britain's Got Talent" judge David Walliams since 2010. The Dutch-English couple also has a one-year-old son Alfred Walliams.

What may have ignited the wrath of the Beliebers more aside from the photo ads is Calvin Klein's short commercial where the "Boyfriend" singer pulled Stone in what appears to be a kiss.

The extreme reactions is not the first from the Beliebers. According to The Public Slate, the fans have also posted death threats to Selena Gomez, who was romantically involved with Bieber, on various social media networks in 2010. The 22-year-old celebrity never addressed the online threats however.

On the other hand, the 31-year-old Dutch fashion model did not reply to any of the threats, but instead re-tweeted those who lauded the racy photoshoot.

It is also not the first time the 20-year-old singer was shown wearing the Manhattan-based fashion house's underwear product. In September 2014, Bieber stripped down to a red and black Calvin Klein boxer during Fashion Rocks.