January 28, 2011 2:34 pm Jennifer Morrison: Working with Katy Perry Was “Surreal” The “How I Met Your Mother” actress says she was surprised that pop star Katy Perry was a “sweetheart” during filming for her guest spot on the show. US & World Videos 1:45 NYPD enters Columbia University in riot gear to clear protest 4:28 ‘Apples Never Fall' and ‘Jurassic Park' star Sam Neill reveals his real name 3:21 Katy Perry's surprising regret about cheeseburger Met Gala look 1:01 Biden administration plans to reclassify marijuana as a Schedule III drug 2:28 King Charles returns to public duties amid cancer diagnosis