• On Sunday's episode of Keeping Up with the Kardashians, Kourtney Kardashian reveals that she was robbed by a member of her staff.
• The alleged thief stole at least $5,200 from the star and spent time alone with Kourtney's children.

Kourtney Kardashian dropped a bombshell in Sunday's episode of Keeping Up with the Kardashians.

While her sister Kim Kardashian West is getting ready for the Met Gala, Kourtney reveals that she and her ex, Scott Disick, have been robbed … by a member of her own staff … who is still working for her.

The realization comes when Kourt and her team start noticing things going missing—iPads and large sums of money, specifically. It quickly becomes clear that the guilty party has to be someone on the inside.

"This lady stole $700 out of my wallet, then she stole $4,500 out of Scott's," Kourtney later tells Khloé. "Then my security, who's here today, just said he's seen her two times with her flashlight on in the office."

Kourtney comes to a firm and fairly obvious conclusion: "She's never coming here again."

"No s**t, Sherlock," Khloé replies, in true Khloé fashion.

Then, Kourtney drops another bomb: The suspected thief is at the house. When Kourt learns that the woman has also "hacked everything" and is looking at her texts, Khloé tells her she needs to take action.

"Go talk to your security—why are you texting if someone's telling you that?" Khloé yells as Kourtney continues to use her phone.

The sisters make it downstairs just in time to see a car peel off down the street. Even though they failed to catch the woman, Kourtney learns from the situation and immediately begins instituting policy changes.

"We need to change the iTunes password, right now," she tells her staff. "We need to debug the house and I want to take every device and unconnect it from my phone. And next time, we've learned a huge lesson. They cannot step foot in here for an interview without us having their social, name, and address."

Later, when Disick arrives to discuss the drama, Kourtney reveals one more shocker: The woman in question was left, at some point, alone with the couple's children.

"This chick was nuts, man, but, yeah, at the end of the day, at least she wasn't doing anything around the kids," Disick says.

Later in the episode, Kourtney offers an update on the situation. "I mean, just the police are doing an investigation and it's still moving," she tells Khloé and their mom, Kris Jenner.

In an interview segment, Kourtney reflects on the ordeal, saying, "I obviously can't change what happened, but like anything in life, I believe that this is a big learning lesson … I just want to start fresh and get this bad energy out."

Kayleigh Roberts is the weekend editor at Marie Claire, covering celebrity and entertainment news, from actual royals like Kate Middleton and Meghan Markle to Hollywood royalty, like Katie Holmes and Chrissy Teigen. She’s a Ravenclaw who would do great things in Slytherin. To learn more about her, google “Leslie Knope eating salad GIF.