The former TOWIE star, 27, felt so strongly about the fortunes of the 'Baby' singer that he shared his opinion with his two million Twitter followers.
Mark took to Twitter last night (7 February) to post several messages about Justin, and wrote the messages directly at the star - although, perhaps unsurprisingly, Justin has not yet responded.
The reality TV star began by writing: "Reading stuff online about @justinbieber seriously he needs to be left alone Ok he's made a couple of mistakes but what 19 yr old doesn't."
Obviously sympathising with the wayward singer, Mark went on to say: "It seems like everyone is just out to get him at every little step he takes. Fair enough 1 or 2 things he's done are wrong."
Reading stuff online about @justinbieber seriously he needs to be left alone Ok he's made a couple of mistakes but what 19 yr old doesn't— Mark Wright (@MarkWright_) February 7, 2014
Mark is no stranger to criticism himself after his lothario behaviour won him many haters on The Only Way Is Essex.
But Mark credits fiancée Michelle Keegan with changing his ways and transforming him from a boy into a man.
If only Justin had his very own Michelle Keegan!
Teenage singer Justin was recently arrested on suspicion of driving under the influence, resisting arrest without violence and driving with an expired license.
He also handed himself in at a Toronto police station where he was charged for allegedly assaulting a limo driver in the city in December 2013.
Do you agree with Mark that Justin's behaviour is normal for a 19 year old? Tell us below!