Rihanna makes nervous rapper wet himself

Rihanna poked fun at her own `tough as nails` image with a SNL skit where


she made a mumbling rapper wet his pants during a duet.

The `Umbrella` hitmaker
teamed up with comedian Andy Samberg for the skit, reported Sun online.

Performing in front of a class of kids, Rihanna sang her part before handing over to Shy Ronnie, who found the occasion too much.

In her trademark delivery, Rihanna sang "Speak up. Shy Ronnie, speak up."

Nervous Ronnie continued to mumble, with Rihanna impatiently singing him some advice, "Move the mic away from your face. Come on, this beat cost a lot of money."

Then still singing, she looked down in disgust and groaned, "Oh no! Oh no! He`s pissed himself. Oh boy, should have paid Kanye. Bye Shy Ronnie, bye bye."

Rihanna then walked out of the classroom, only for Shy Ronnie to suddenly burst into life and start rapping like Eminem.

But he hurriedly went back to mumbling when Rihanna briefly returned singing "Forgot my purse. Bye."