It's a boy for Kim Kardashian and Kanye West.

The celebrity couple is expecting their first son together, according to Us Weekly. He will join his big sister North, who is 2 years old.

"Kanye loves Nori more than anything but to make his world complete he wanted a little boy, an heir," a source close to the rapper told Us Weekly. "He's overjoyed."

Kardashian and West have worked tirelessly to conceive a second child. The latest season of "Keeping Up with the Kardashians" captured the struggle to get pregnant over the past year and the options they pursued to help the process, including in vitro fertilization as well as a trip to the psychic John Edward.

"We are trying. We are trying every single day," Kardashian told E! News in May. "You can't try harder than we try. It's getting exhausting. [Kanye] always says, 'Trying for baby No. 2 isn't as fun as trying to baby No. 1.'"

The pregnancy announcement came during the "KUWTK" promo that aired on May 31. "I just got the blood test back and I'm pregnant," the expectant mother told her sister Khloe Kardashian.

Baby No. 2 has given Kim some severe morning sickness, but she's just happy to be pregnant again.

"I can barely get out of bed," she told Us. "But it's so worth it. I don't really care."