​From Wikipedia, the free encyclopedia. Rhiannon Leigh Wryn  (born January 4, 2000) is an American child actress. Her biggest role to date is in the 2007 science fiction film The Last Mimzy, where she plays Emma Wilder, one of the main characters. Description above from the Wikipedia article Rhiannon Leigh Wryn, licensed under CC-BY-SA, full list of contributors on Wikipedia