It's a bid day, folks! Kylie Jenner and Travis Scotts baby girl Stormi Webster is a year old ... happy birthday!!!

Kylie's been preparing for this day for months -- with a 1/2 birthday party, a 9-month celebration, a trip to the Caribbean a month ago in honor of her baby and now it's finally the actual day. Auntie Kim Kardashian posted this sweet snap of Stormi and daughter Chicago West in their walkers at what appears to be Kylie's house and captioned it: "Happy Birthday to the sweetest baby girl Stormi! We love you so much!!! 💕"

The cousins are only two weeks apart in age -- Chicago just celebrated her first birthday January 15. Do the KarJenners plan this stuff so their kids are the same ages???