Kim Kardashian -- I'm Pregnant!

North West is going to be a big sister ... Kim Kardashian and Kanye West are expecting baby #2.

After struggling to conceive, Kim made the big announcement Sunday night during "Keeping Up With the Kardashians."

North was born on June 15, 2013, several weeks before her due date. Kanye and Kim have been trying for a second child for some time ... visiting several different specialists and fertility doctors.

No word yet on how far along she is or the sex of the baby.