The US reality TV star and new mum, 33, was removed from the famous compound on Friday (28 August) after comments she made about Adolf Hilter two years ago came to light.
A statement from Channel 5 said: "Unfortunately, Channel 5 and Endemol did not know about the views and attitudes Tila had expressed in social media postings prior to her involvement in Celebrity Big Brother.
"When they were brought to our attention, she was called to the Diary Room for a discussion with producers and was subsequently removed from the house. The views Tila had expressed, and permitted to remain uncorrected, are totally unacceptable and, accordingly, her continued involvement in the programme was untenable."
Playboy model Tila has now spoken out and apologised for the offensive comments she posted in a blog in 2013, in which she expressed sympathy with Hitler and said he was a "good man".
In a soul-bearing statement, Tila now blames "severe depression" and "drug addiction" for her "careless mistake".
She says: "Back in 2013, I made a statement about Hitler not being a bad person, and immediately realised soon after that I had made a terrible mistake that would ultimately come back to haunt me.
"During that time I had been suffering from severe depression, and drug addiction for many years prior to that.
"I also attempted to commit suicide in 2012 and overdosed on prescription pills. I wanted to die. I felt worthless and unloved as that pain continued to grow causing me further to spiral out of control. Losing touch of myself and reality."
Tila also apologised to anyone she hurt along her "self-destructive path" and described herself as a "flawed human who is trying my best to be a better person than I was in the past".
She goes on to insist she is not racist or a Nazi supporter, and asks for forgiveness and a second chance.
Tila had been on Team USA in this year's UK versus USA-themed house. It is unclear whether another American housemate will be drafted in to replace her.
Bobby Davro and Janice Dickinson entered CBB on Friday night after a live battle to become head of the house, which Bobby won.
See the full line-up of CBB contestants:
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