For the MCU AU fest I received this terrifically fun, sexy, and funny fic:
http://archiveofourown.org/works/4104319/ It's Steve/Howard/Peggy, modern celebrity AU with pre-serum Steve really enjoying being in over his head.
Summary from the fic: Peggy Carter and Howard Stark are perpetually locked into the titles of "Academy Award Nominee" but that has a chance for change when they run into a young film writer.
There are also other great AUs in the collection too:
http://archiveofourown.org/collections/MCUAUFest2015/works