Britney Spears steps out for Christmas tree lighting ceremony in Vegas...

For once, Britney actually looked happy to pull a switch during the Christmas tree lighting ceremony in Vegas last night. 

The hair I'm iffy about, but other than that I think she looks nice. At least her smile didn't look creepy or overly forced. The event took place at The LINQ Promenade.

  
It was only a few hours earlier she was doing... THIS:

Thoughts?