In a last-minute move on the part of American Dreams, NBC's feel-good drama has tapped rising starlet Ashley Williams to guest as mod British singer Sandy Shaw in Sunday's episode (airing at 8 pm/ET). The Good Morning, Miami leading lady will perform "Always Something There to Remind Me" and, if there is a God, make us forget the wretched rendition that Nikki McKibbin once delivered on American Idol.