Uh-oh!

We wouldn't be surprised if we didn't see her on the Saturday Night Live stage for quite some time after this!

While Rihanna put up some seriously solid performances on the sketch comedy show last night, she reportedly gave producers some serious grief when she called in sick for the dress rehearsal...which takes place RIGHT before the actual show!

Sources revealjustified, she is seriously over-working herself, and hope that she takes the proper amount of time to recuperate!

There's no point in scheduling so many appearances if you're not going to be at your best for them, gurl!

Ch-ch-check out her first performance from last night (above)!

What do U think?? Does she look sick to U??