Kelly Clarkson, The Backstreet Boys, Rafael Nadal & More Hot Celebrity Sightings For Monday, November 11, 2013

Kelly Clarkson Sings!
The newly engaged star shoots her latest music video.
So many photos, so little time. We spotted tons of celebrites out and about and attending events.

Singer Kelly Clarkson performs a private concert at Swangard Stadium in Burnaby, Canada.

Boyband Backstreet Boys perform on “Lo Canto” in Milan, Italy. 

Rafael Nadal competes against Roger Federer in the men’s singles semi-final match at the Barclays ATP World Tour Finals against at O2 Arena in London, England.

Launch the gallery to check out all the pics, and find out who was where and when!