Rihanna vs. JR Smith Beef: NBA Superstar Disses 'Fake' Miami Heat Fans On Instagram, Including Drake's 'Thirsty' Ex (Rumored Fling) [PHOTO]

Just about a year ago, rumors suggested that NBA baller J.R. Smith had a short-lived "fling" with pop songstress, Rihanna:

Rihanna and JR Smith Flirt & Party? [PHOTOS]: RiRi Moves On From Chris Brown, Dating NBA Ex-Flame?

Well, apparently those romantic feelings are now long gone. On Monday (July 14), the 28-year-old New York Knicks player posted this viral Instagram photo, totally dissing the Barbadian beauty's "loyal" team affiliation:

teamswish: "Lmfao #greatmorningworld."

Ouch.

Drake's ex will likely not take this blatant insult very well.

RiRi's been very involved with the crazy fandom surrounding the World Cup, so she has yet to respond to Smith's diss. But just wait, surly some sort of beef will erupt on Twitter sometime soon...