Justin Bieber and Kendall Jenner strip down to their underwear for new Calvin Klein spring ad campaign

  Not shy: Singer Justin Bieber shared a shirtless photo of himself in black underwear as he showed off his new Calvin Klein campaign on TuesdayModel: The 21-year-old 'broke the internet' when he was first seen as the face of Calvin Klein last January

Pop star Justin Bieber shared another shirtless photo of himself, this time modeling black underwear as he unveiled Calvin Klein's new spring 2016 advertising campaign on social media on Tuesday.
But it wasn't just the popstrel who is starring in the advert as Kendall Jenner also shared images from her shoot that same day.  
Check out the photos after the cut 

Getting a grip: Justin and model Lara Stone starred in last year's Calvin Klein spring ad campaign

New campaign: Kendall Jenner also shared photos of herself in a white Calvin Klein bra and briefs on Instagram on Tuesday

Back to basics: The 20-year-old reality star showed off her figure in the new 2016 spring ad campaign