Rihanna Dancing on Stage at N.E.R.D.'s University of Missouri Concert

I dunno what's wrong with me. I pretend to have a heart of ice and call this young woman a psycho b*tch, but seeing Rihanna shaking her booty has melted my heart. Heh. I was suddenly reminded that she's a young woman who fell madly in love with an a-hole and she has her whole life ahead of her to be with better men and to sort out her issues.

All is forgiven, well, at least in this post it is.

N.E.R.D performed at the University of Missouri-Kansas City last Saturday and Rihanna had an impromptu dance on stage.

"It was a complete surprise!" Ashley Lang, president of the UMKC's Activity and Program Council, tells E! News exclusively.

Rihanna, clad in blue jeans, a cropped tee and a hoodie and accompanied by a group of girlfriends, hung out with N.E.R.D. frontman Pharrell Williams in what looked to be a "totally friendly manner," according to Lang.

"When Pharrell called his special guest to the stage, Rihanna came out a little bit surprised but totally went with it." Incidentally, Rihanna and Pharrell share a publicist,.

Rihanna left the show after N.E.R.D.'s last song and hit up the local bar scene with her friends. Awwww. There's nothing more heartwarming than hearing about a ho shaking her a*s and then hitting up the bars with some girlfriends. Work it out.