Ashley Jensen (born August 11, 1969) is a Scottish actress who is best known for her roles as Maggie Jacobs on British sitcom Extras from 2005 to 2007 and as Olivia Hollenbeck on the CBS sitcom Accidentally on Purpose from 2009 to 2010. She voiced Nanette in the 2011 Touchstone Pictures animated film Gnomeo & Juliet .