04/13/2009 05:12 am ET | Updated May 25, 2011

Reese Witherspoon's Crazy "Monsters" Week

Reese Witherspoon spent the week jumping around Europe on an extended junket to promote the animated DreamWorks feature 'Monsters vs. Aliens,' in which she voices the lead Susan.

The movie comes out in the US on March 27. Scroll down below the slideshow to watch the trailer.

Proving people don't get paid to make movies, but rather to promote them, Reese, along with fellow voice Keifer Sutherland, smiled for cameras in Berlin, Madrid, London and Rome.

Fortunately, it wasn't all work and no play.

While in Spain, paparazzi snapped Witherspoon and boyfriend Jake Gyllenhaal heading to the Prado museum.

Friday the pair strolled around Rome and went to the Vatican museum.