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earlier in the day:

 

Stepping out for a publicity appearance, Christina Aguilera was spotted at the NBC Network 2011-12 Upfront Presentation today (May 16).

 

The “Ain’t No Other Man” songstress looked fabulous in a black dress with white polka dots and red peep-toe heels as she hammed it up for the cameras.

 

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And leaving:

 

Christina Aguilera, holding onto roses given to her by David Letterman, and Matthew Rutler seen arriving at their hotel in New York City. Aguilera taped an appearance on the "Late Show with David Letterman" . (May 16, 2011 - Photo by PacificCoastNews.com)

 

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