Justin Bieber, Kendall Jenner strip off in ad campaign

Singer Justin Bieber and model Kendall Jenner are among the celebrities featured in the Spring 2016 Calvin Klein global advertising campaign.

Both of them took to Instagram on Tuesday to share photographs of themselves in their Calvin Klein underwears, reports aceshowbiz.com.

As the campaign particularly asks them what they do in their Calvin Klein underwears, Bieber answered: "I flaunt in #mycalvins."

His answer appeared as a tagline in an image he posted on the photo-sharing website. The photograph showed him shirtless flaunting his toned figure in black Calvin Klein boxers. He lifted up one of his arms and one of his legs. A white statue of a naked woman stood next to him.

Meanwhile, Jenner gave a flirty answer to the question from the campaign.

"I want to be with you in #mycalvins," she said.

Her answer appeared in the last part of an Instagram video showing photographs of parts of her body.

A caption for the video read, "I want to be with you in#mycalvins. My new Spring 2016 @calvinklein campaign... What do you do in yours?"

In addition to Justin and Kendall, other celebrities joining the campaign include Kendrick Lamar, FKA twigs, Abbey Lee Kershaw and Fetty Wap.

They shared with their followers on the social media snaps of themselves with the answers to the question posed by the campaign.