It's been three years since pop superstar Katy Perry stopped being Russell Brand's wife, after the British actor and comedian filed for divorce citing "irreconcilable differences" to rarely speak of the relationship in public ever again - but now, as he releases a new documentary, he's finally dishing on the divorce.

Perry was officially Russell Brand's wife for two years, although they split 14 months into their marriage (supposedly after the "Get Him to the Greek" star ended their relationship via text message), but the actor, who is always outspoken although keeping his private life to himself, hasn't said much about the divorce since, but his new documentary "BRAND: A Second Coming" sees him dishing about his ex - and what he has to say is far from pleasant.

According to Us Weekly, in a new trailer for the upcoming documentary, the actor speaks about the woman who was once Russell Brand's wife in a clip seemingly from the time they were married.

"Oh my f-king god. I'm living this life of the very thing I detest," says the British comedian, speaking of then Russell Brand wife, Perry. "Vapid, vacuous celebrity. Fame and power is bulls-t."

The Daily Mail reports that it's not the only shade he throws in the film, as another clip shows the star mocking Perry's English accent, besides also admitting to friend Stephen Merchant that he didn't think Perry would be Russell Brand's wife for long, after he visited Africa on a 2010 trip and his views on the world changed.

Brand isn't all that happy about the documentary, having tried to keep it from showing at SWSX last spring, with director Ondi Timoner saying he was "difficult" to work with.

In the meantime, a source close to this year's Super Bowl halftime star told Hollywood Life that Perry is "livid" and "deeply upset" at Brand's comments, describing his actions as "heartless."

You can watch a clip of the actor dissing Perry when he was still Russell Brand's wife below.