On her Loud tour this summer, Rihanna has been wowing crowds. And we're guessing thousands of Canadian fans thought, "Wow, what a pro," after she took a spill onstage this week.

Not that she missed a beat! The singer, 23, was striding across the Edmonton, Canada, stage in stiletto boots when she tumbled to the ground -- see video after the jump. She's had similar mid-concert mishaps in the past, which may be why she seemed perfectly confident about shrugging it off and continuing her song.

Meanwhile, her tourmate Cee Lo Green may not be falling down, but he is dropping out. After a Twitter controversy in which the 'F--- You' singer lashed out at a critic of his recent live performance, the Grammy winner has resigned as Rihanna's opening act.