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Khloe Kardashian is one smart lady!

In a sneak preview for Sunday's all new Keeping up with the Kardashians, the famous sister gets a phone call from Kris Jenner that immediately raises some suspicions.

"Mom called me and said Kanye is going to send a private plane and he wants us all in San Francisco," Khloé explains to Kourtney Kardashian. "We can't say a word."

But instead of speculating the reasons behind this top-secret trip, Kourt is more excited about the required dress code. "Black tie is fun!" she says. 

Khloé becomes even more intrigued because it's around the same day as Kim Kardashian's birthday.

"In my gut, I feel like something big is about to happen," Khloé tells the camera. "I think the weirdest part is that Kourtney doesn't think anything is going to happen." 

It looks like Kim and Kourtney are in for one big surprise! 

Watch the two-part Keeping Up With The Kardashians engagement event February 9 and 16th at 9/8c only on E!