Kevin Durant -- Brunching with Bieber

Sooooo Kevin Durant had brunch with Justin Bieber over the weekend.

Question is ... who paid??

For the record ... Bieber has earned roughly $60 million in the last year alone (according to Forbes).

Meantime, Kevin Durant is getting toward the end of a 5-year $86 million contract with the OKC Thunder ... and that doesn't even include the money he's made through endorsement deals.

So, who paid??

Probably Scooter.

BTW -- Bieber was rockin' a Nets hat ... but don't read too deep into it ... the guy's the ultimate fair-weather fan and usually selects his hats to match his outfit.