Here's hoping he doesn't have mono.

Justin Bieber was kind enough to not only mock a fellow gym-goer at a North Carolina Ritz Carlton, but he (or a member of his entourage) also spit in her water bottle. Nice!

TMZ reports that local radio host Colette Harrington was working out when she asked the Canadian Mary Jane enthusiast for a photo. She claims that he said no and she went about her workout as usual.

Harrington says Bieber was with two other people -- a bodyguard and a backup dancer or singer -- and that they proceeded to make fun of her the entire time they remained in the gym. She explained, "I always count out loud my reps. Then Justin starts imitating me, and whenever I'd get to 20 he and his buddy would say 'Shut the f--- up.'"

In fairness to Bieber, that does sound kind of annoying, but if he were going to act like a douchebag, he probably should have posed for a photo to hedge his bets that the story wouldn't get out.

Harrington claims she ignored the pissed-off posse but that they kept on jeering -- and that one of them spit blue Gatorade into her water bottle when she wasn't looking. (This may be the true definition of Haterade, guys.) Oh, and she totally drank it, too.

"I did not look at my water bottle before taking a drink," she assured. (Seriously though -- how could she not see this happen? How far away was her water?)

Harrington filed a complaint with the hotel, but when you're as loaded as Justin Bieber, chances are nothing's going to come of it. The Ritz Carlton wouldn't comment on the story, and Bieber's rep insists that he and his gaggle were dissing each other, not Harrington, and that none of them spit in her H2O.

Still, Harrington is capitalizing on the incident -- for a good cause. She's selling the saliva-soaked bottle on eBay and donating the money to charity.