The Hangover Part III includes actors.
Edward Parker Helms ( born January 24 , 1974 ) is an American actor , comedian , and singer . Heather Joan Graham ( born January 29 , 1970 ) is an American actress . Jeffrey Michael Tambor ( born July 8 , 1944 ) is an American actor , voice artist , and comedian widely known for his roles as Hank Kingsley on The Larry Sanders Show , George Bluth Sr. and Oscar Bluth on Arrested Development , and Maura Pfefferman on Transparent , for which he has received one Golden Globe , one Screen Actors Guild and two Emmy Awards . The Hangover Part III . In January 2012 , the principal actors re-signed to star .