Adele ditched Las Vegas to hang with her boyfriend Rich Paul -- and she had a good reason ... it's the dude's birthday, which means the whole Klutch Sports crew tagged along.
The singer was rolling deep with LeBron James, Anthony Davis and other Klutch clients for the super agent's 42nd born day party Saturday night ... which went down at WeHo venue -- where everybody filed out of one exit towards the end of the night, it seems.
As you can see, RP's biggest claim to fame in King James was front and center, leading the huge pack of people outside .