The Australian actor, who has been in and out of a Sydney psychiatric clinic since allegedly attacking former girlfriend Rachael Taylor last year, said that the support of his famous friends helped him get through an "interesting" time in his life.
While speaking on Sandilands's radio show, Newton revealed that the former X Factor judge called him on the second day he went into the rehab centre, and that they have been in constant contact ever since.
He also said that fellow X Factor judge Ronan Keating "called [him] on day two as well and has been a constant friend throughout this entire period", adding: "He is a terrific bloke."
Newton was originally the presenter of The X Factor but lost the role to Home and Away star Luke Jacobz after the Taylor scandal broke. During their short time together on the show, Newton said that he, Sandilands and Keating "really bonded".
The former Underbelly star also spoke about his battle with bipolar depression, obsessive compulsive disorder and social anxiety, saying: "The most difficult thing about mental illness is that it is designed to convince the person that is afflicted that they don't have an illness."
Newton recently described himself as a "lost soul", adding: "Going to hospital and having that time to get a sense of who I was, it really allowed me to stop and smell the flowers. It really saved my life. I feel like I'm in the best place I've ever been."
Watch the trailer for Newton's latest movie Face to Face below: