Kim Kardashian, Kanye West are expecting a boy

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Kanye West and Kim Kardashian-West

(CNN) โ€” Way to break the news, Kim K. โ€” letting it slip oh-so-casually in a Father's Day tweet.

The reality TV star announced she and hubby, Kanye West, are having a boy in a post late Sunday night (June 21).

"You're such a good daddy to North," Kardashian said in a tweet directed at her other half, "& you will be the best daddy to our new son too!"

Kardashian, 34, and West, 38, already have a daughter, North, who turned 2 last week. The news that they were expecting a second child emerged late last month.

The couple, often referred to as Kimye, got married in Italy last year.

Kardashian has said she that although she didn't suffer from morning sickness during her pregnancy with North, it was still "really painful everywhere."

She had made no secret of the couple's desire to have another child.

"We are trying. We try every single day. You can't try harder than we try," she told E! News in late April. "It's getting exhausting."

West has repeatedly said that trying for baby No. 2 wasn't "as fun" as trying for baby No. 1, Kardashian said at the time.

CNN's Jethro Mullen contributed to this report.

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