Scott Disick 'Under Fire' After Kardashian Sisters Find Out He Brought Another Woman on Family Vacation

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Scott Disick faced the wrath of his ex Kourtney Kardashian's sisters and mother when he joined them at dinner while on vacation in Costa Rica.

In a preview clip for Sunday's Keeping Up With the Kardashians, the father of three joins Kourtney, Kim, Khloe, Kris Jenner and Cory Gamble at the dining table, unaware that they know of the woman, Chelsea, that he's brought on the family getaway.

WATCH: Scott Disick Admits Kourtney Kardashian Still Turns Him On, Says He'll 'Never Be Over Her'

Tensions rise as the ladies refuse to tell Scott right out about what they know, but he soon catches on when Kim asks, "Did you guys hear what Chelsea said?"

"Oh, yeah," Khloe responds. "She's such a b**ch."

The sisters pretend to be talking about Chelsea Handler and Chelsea Clinton, but Scott is onto them. "Let's cut the bulls**t," Kim finally says.

WATCH: Kourtney Kardashian and Scott Disick Are 'Back At It Again With the Co-Parenting Skills' in Hawaii

At that moment, a group of fire dancers arrive and begin performing. "It's pretty obvious that the girls know something's up," Scott admits to camera. "Nobody really wants to say what's on their mind, and if this dinner isn't awkward enough, these fire dancers have to come out and start doing hula hoops. I already felt like under fire."

The awkward dinner occurs after Kim caught Scott with another woman during their trip to Dubai in last week's episode, and went off on her. "What the f**k are you doing here? You're such a whore! You're such a tramp," she yells at the woman. "Get your s**t and get the f**k out of here... security will escort you the f**k out of here."

WATCH: Scott Disick Calls Kourtney Kardashian the Love of His Life, Khloe Says the Two 'Kissed'

In January, a source told ET that "there has been no chance of reconciliation for quite some time now" between Scott, 33, and Kourtney, 38. 

The source added that the reality stars have mastered co-parenting their children, Mason, 7, Penelope, 4, and Reign, 2. "Kourtney and Scott do an incredible job of co-parenting and truly are unmatched when it comes to putting on a strong front with the kids," the source explained. "They never discuss any of their issues in front of the kids."

KUWTK airs on Sunday at 9 p.m. ET/PT on E!

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