KaitlinWillowOlson(bornAugust18,1975)isanAmericanactress,producerandcomedian.ShebeganhercareerintheGroundlings,animprovisationalgroupinLosAngeles,California,andhadminorrolesinseveraltelevisionseriesbeforebeingcastasDeandra"SweetDee"ReynoldsontheFXcomedyseriesIt'sAlwaysSunnyinPhiladelphiain2005.