Popsugar Entertainment Sierra Burgess Is A Loser Who Plays Sierra's Mum in Sierra Burgess Is a Loser? Sierra Burgess May Be a Loser, but Her Mum Is an Iconic Actress 12 September 2018 by Amanda Prahl View On One Page Photo 5 of 8 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 5 Some Kind of Wonderful (1987) Previous Next Start Slideshow Sierra Burgess Is A LoserLea ThompsonNostalgiaMovies