Shanna Moakler has entered the chat and she's bringin' bubbles and bosoms ... and we are here for it all!!!

Leaving little to the imagination, the actress-model posted up in the jacuzzi and rocked this black one-piece!

Approaching 50 ... The hot mom of three will turn the big 5-0 in a couple weeks -- and these hot shots show she's still smokin' hot!

Once you've cooled off from Shanna's steamy snaps, hit up the gallery above and enjoy a fun game of guess who ... hot mamas edition!