'Flip Or Flop' Star Tarek El Moussa SLAMS Ex-Wife Christina Haack

Tarek El Moussa reportedly went OFF on his ex-wife, Christina Haack, screaming at her that his new fiance is richer and hotter than she is!

According to reports, the famous duo was filming their popular reality show, 'Flip Or Flop,' when El Moussa took offense to how his ex-wife summoned him for the next shooting scene. Apparently, the incident took place last Wednesday while cameras rolled, and Tarek didn't like the way Christiana "signaled him" that she and the crew were ready to begin filming.

El Moussa allegedly exploded and launched into a full verbal tirade against his ex-wife. According to one report, the lashing including comparing Haack to his new fiance, Heather Rae Young, saying that she is richer and hotter than Christina. Damn.

During the incident, Tarek reportedly gloated that he "made" Christina and called her a "washed-up loser" and explained to those listening that he enjoys watching her fail. At one point, according to sources on the set, Tarek yelled, "look at me, look at me, look at me. It's called winning."

In the end, El Moussa allegedly stopped his rant by screaming at his ex-wife, "The world knows you're crazy." The production decided to separate the two following the incident and have them filming at different times.

So...what set him off? According to sources close to Tarek, the reality star's anger stems from Christina's recent admission that she smoked toad venom. He says his main concern is for the former couple's two children. At the time, Haack revealed the drug use while explaining she has a new boyfriend.

"I met Josh when I wasn’t in a state of fear or fight-or-flight … I had taken time off social, hired a spiritual coach, and smoked a Bufo toad (which basically reset my brain and kicked out years of anxiety in 15 mins),” she wrote.

Christina continued, "When we met this past spring, the synchronicities hit us so hard and fast they were impossible to ignore. I felt immediately crazily protective over him and wanted to keep him for myself and get to know each other before the tornado (media attention) hit. We’ve had a few solid months of just us getting to know each other and I’ve loved every second of it. So-called “fame” provides so many things but it comes with a cost. They build you up then tear you down."

The word is...this isn't the first time Tarek has targeted his ex-wife while on set. But, Tarek and Christina are both executives on the show and realize there will be tension between them from time to time -- and they will have to deal with it.

As we reported, Christina made headlines earlier this month after admitting to smoking the psychedelic drugs before meeting her new boyfriend. The reality star is also dealing with a divorce from her second husband, Ant Anstead, who is reportedly dating Renée Zellweger. We broke the story; the ex-couple recently settled their divorce, with Christina keeping her Newport Beach home and a Bentley.

Tarek is currently engaged to the 'Selling Sunset' star and is planning an upcoming wedding.