*Confused* This song is not by Rihanna?

The few times I've heard this song on the radio, I thought it was by Rihanna. So I was fooling around on youtube when I saw some song in the suggestions bar with over 20 million hits. I'm like, "Who da hell is Shontelle?" I click on it and it's Rihanna's song. LOL. I guess I really am out of the loop. I know Rihanna is successful, but of all people to copy vocally. *smh*