AceShowbiz -

Kourtney and Khloe Kardashian are back at it again with their feud. In a new promo for the upcoming season 14 finale of "Keeping Up with the Kardashians", the sisters embark on a sightseeing boat trip in San Fransisco when things suddenly get heated between the two.

While Khloe and Kim Kardashian are snapping pictures during their boat ride back from visiting Alcatraz island, Kourtney Kardashian is busy talking on the phone. It eventually makes the Good American founder lose her patience with her oldest sibling.

"What the f**k are you here for? Don't chime in if you're not going to get off your f***ing phone call all the time. You're like a waste of space in my meter right now," Khloe fumes, to which her sister responds, "I'm looking at everything."

Kourtney's response clearly doesn't sit well with Khloe. In fact, it only sets her off even more. "You're annoying as f**k now when we're together," she snaps. "This is what you do. You're on your phone the whole time. You're just not present!"

The oldest Kardashian sister tries to defend her "10-minute conversation," but both Khloe and Kim are just not having it. When Kourtney asks whether her act is offensive, they simply answer, "Yeah."

"We're only here once," Khloe, who is currently expecting her first child, continues to rant. "When are we ever going to go back to Alcatraz? You know what? Actually, I'm not doing this today. I'm not doing this today, because last time in Costa Rica, I looked crazy because I'm always the one complaining to get you guys to have fun. I'm not going to be crazy, okay? You'll be the f**ing b***h that you need to be."

And after that, Kourtney decides to end their bickering by calling Khloe a "f***ing w***e," adding, "Pregnant w***e!" Kim, meanwhile, ignores their sisters during the moment.