Justin Bieber is angry a website made it look like Calvin Klein pumped up his muscles using Photoshop, and unless he gets an admission he's going to court.
Justin's team fired off a demand letter -- obtained by TMZ -- threatening breatheheavy.com with a defamation case for posting a GIF showing Justin transformed from mildly muscly to jacked.
The Biebs and company say the puny photo is fake ... clearly Photoshopped, and it's damaging his brand.
Bieber's team wants 2 things: remove the post and acknowledge the deception ... or else.
See also
Justin Bieber -- Calvin Klein's Happy Trail of LIES!!!
Calvin Klein Model Lara Stone Warned: Back Off Bieber Bitch, Or We'll Kill You
ncG1vNJzZmivp6x7tbnZZ5qopV9nfXKBjmloaGlgZLe2v9OipWaamZqvpr6MqZ%2BorJ%2BotbC8z56bZpuRocOquoyko56hnmKupXnMrqqcpJWoeqetyp5koKGWYrmiw9KuoK1n