UPDATE: Friday, Oct. 30 (3:52 p.m.) – Leah Remini is expected to drop some huge bombshells about Tom Cruise and the Church of Scientology in tonight’s 20/20 interview, and the Mission: Impossible actor’s ex-wife Katie Holmes has released a pre-emptive statement.

Holmes has been tight-lipped about her split from the controversial religion following her divorce from Cruise and she is still keeping mum, her reps issuing the following statement on her behalf: “I regret having upset Leah in the past and wish her only the best in the future.”;

Leah Remini’s interview airs tonight on 20/20.

Growing up in the Church of Scientology can result in young Scientologists developing a superiority complex, admits Leah Remini in a clip of her upcoming 20/20 appearance that aired on this morning’s edition of Good Morning America.

Promoting her new tell-all book Troublemaker: Surviving Hollywood and Scientology, Remini discusses how the controversial church’s alleged brainwashing techniques can lead to an “extremely inflated”; ego at a very young age.

Related: Leah Remini — “Being Critical Of Tom Cruise Is Being Critical Of Scientology Itself’

“Because Scientologists view children as spiritual beings, you’re not treated as a kid,” says the former King of Queens star, who broke away from the church in 2013. “You’re given a lot of responsibility, your ego becomes extremely inflated.”;

Her decision to exit the church, she admits, was not an easy one; for Scientologists who break ties with the church after growing up in the religion — as she did — it usually means the end of the only life they’ve ever known.

Related: Leah Remini Braces For Scientology Backlash With Release Of Tell-All Book

“The decision to leave is you are giving up everything you have ever known and everything you have worked for your whole life,”; she said of her defection.

Leah Remini’s interview with 20/20 airs Friday, Oct. 30.