Kesha says the party don't stop ... and, neither do her hottest pics -- 'cause we've got a whole bunch from her entire career to highlight her birthday!

Happy birthday, Kesha! The singer gave us some of the biggest bangers of the 2000s, with at least one of her songs blaring ...

Social interactions––whether attending fitness classes, participating in diet-planning discussions, or engaging in group challenges––help build a sense of community.