Mariah Carey will be swimming in blankets, rattles and Diaper Genies this weekend ... when she attends her baby shower in Beverly Hills!

TooFab has learned the pregnant singer's "Pink and Blue" shower will be held this Sunday night from 7pm-9pm at a swanky Bev. Hills hotel -- "Pink and Blue" because Carey's having a girl and boy with husband Nick Cannon.

The bash is being hosted by Mariah's publicist Cindi Berger, her manager Louise McNally and Stefano Zagni of Angel Champagne -- check out the full invite above!

We've also learned some of the items on Carey's gift registry for the shower, which includes a $2,000 custom-made bedding set for a crib, a $350 custom-made car seat cover, a $1,200 giraffe and, surprisingly, no Hello Kitty!

Mariah is due this Spring.