Watch Pregnant Khloé Kardashian Learn the Sex of Her Baby with Tristan Thompson

Khloé Kardashian is expecting her first child, a baby boy

Surprise! Khloé Kardashian‘s baby gender reveal “shocks” sister Kourtney Kardashian on the season finale of their reality show.

In a promo for next week’s episode of Keeping Up with the Kardashians, the mom-to-be teases, “Do you want to know what I’m having?”

“I’m shocked,” says Kourtney, 38, before she and Kim Kardashian West envelop their sister in a hug.

Khloé, 33, officially announced her pregnancy in December 2017, and PEOPLE has already confirmed she is expecting a son with NBA star Tristan Thompson.

On Sunday night’s episode, Khloé grappled with extreme pain during her first trimester, side effects of her progesterone pills.

Khloe Kardashian/Instagram

“I just feel sick every night,” she said. “I feel gross. I physically can barely walk.”

It’s been a baby boom for the family: Kim, 37, welcomed her third child, daughter Chicago, via a surrogate in January, and sister Kylie Jenner, 20, welcomed her first child, daughter Stormi, in February.

Keeping Up With the Kardashians airs Sundays on E! at 9 p.m. ET.

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