"Scream and Shout" British Accents and Transparent Speakers

The first number one of 2013 is "Scream and Shout", featuring Will.i.am and Britney Spears.
However if you listen carefully Britney is singing with a british accent. Why?
Listen carefully to pick it up.

Did you notice hear accent? Also in this video is a set of transparent speaker, if you think these are pretty cool, check out the kickstarter page for information at http://www.kickstarter.com/projects/652195222/transparent-speaker-1