Christina Haack and Tarek El Moussa split close to 10 years ago—but the mother of three still knows how to get under her ex-husband's skin. She displayed that skill in the latest episode of their HGTV show " The Flip Off " when she teased a "new partner" who she knew would spark some upset.

Flip or Flop has been a powerhouse franchise for HGTV going back more than a decade now, continuing via spinoffs even after Tarek El Moussa and Christina Haack divorced and the original series ended.

Christina Haack and Tarek El Moussa's children appeared on "Flip or Flop" throughout their childhoods, returning to HGTV screens on "The Flip Off."

And HGTV’s The Flip Off, starring fan favorite Christina Haack along with Tarek El Moussa and his wife Heather Rae El Moussa, certainly delivers that. Especially on its latest episode. The former Flip or Flop stars and couple battle to locate,

The designer says fans have been calling her close relationship with her ex and his new wife, with whom she currently co-stars on HGTV's 'The Flip Off' — 'weird'

Christina Haack (formerly Christina Hall) shared a shocking truth about her past relationship with ex-husband Tarek El Moussa, and revealed that his mother, Dominique El Moussa, told the HGTV star that she should reconsider marrying her son.