Rihanna's got GAME!

The sexy chanteuse charmed not one but THREE boys last night at Hooray Henry's nightclub in West Hollywood -- including none other than ex-boyfriend Chris Brown!

Okay, so we don't know if she was giving him lap dances or not, but what we DO know is she and Chris and new boy toy, French footballer Karim Benzema AND Khloe Kardashian's ex, French Montana, all left the club within 30 minutes of each other.

And another thing we know is that BadGalRiRi was wearing a super-sexy pinstripe shorts suit with NOTHING underneath her two-button blazer. MAJOR cleavage happening -- we think Ms Fenty was on point with this look and that sly look she gave as she left the club, with drooling boys trailing behind, says it all!