In a PEOPLE exclusive clip from tonight's new episode of 'The Flip Off,' formerly married co-stars Christina Haack and Tarek El Moussa get called out for their playful demeanor

Christina Haack and Ant Anstead discussed their ups and downs when he appeared as a judge on HGTV's 'The Flip Off'

Christina Haack has a secret weapon in her battle with her ex-husband Tarek El Moussa.  The former couple are facing off in a house renovation challenge in the new HGTV series The Flip Off. So far, Christina has been struggling to beat Tarek and his new wife Heather in the room-by-room challenge.

The Flip Off fans were shocked to see Christina Haack ask ex-husband Ant Anstead to serve as a judge during the Wednesday, February 19, episode. The exes split in 2020 after less than two years of marriage and were involved in a custody battle over their son,

In 2024, Haack made headlines for agreeing to team up with her third husband, Josh Hall, to go against the El Moussas in a home makeover challenge. But Haack and Hall split during the early days of filming amid tensions evidenced in the series' Jan. 29 premiere.

Prior to the post, fans already picked up on clues that Haack and Anstead had become friendly after their divorce. In fact, in a new episode of her show, The Flip Off, Haack invited Anstead, who hosts a home renovation show of his own, as a guest judge.