The mother of two celebrated the tremendous social feat with a selfie, reported People magazine.
Alongside her puckered-up photo, the 35-year-old wrote, "55 MILLION!!!!!!!OMGGGGG!!!!!! LOVE YOU SO MUCH!!!!!!!"
The new milestone wasn't the only exciting news that Kardashian had to share - her special emoji app, appropriately titled Kimoji, is launching on Monday.