R&B superstar Rihanna kicked off the Summer Concert Series on NBC's "Today" show Friday, and had a scary moment while performing "S&M."  As the singer walked next to the crowd, which was held back by a barricade, one fan reached out and grabbed Rihanna by the waist and pulled her towar the barricade.  Ever the professional, Rihanna managed to pull herself away and didn't miss a beat, ciontinuing with the performance as if it hadn't happened, although she did make her way back to the stage for good shortly after the incident.  Rihanna went on to perform all four singles from her album "Loud," all of which earned healthy applause from the gathered crowd.  Clips of all four songs can be viewed below, with an interview included in the "Only Girl (In the World)" clip.

Note:  the grabbing incident occurs at about 1:18 in the first clip.