Emile Hirsch Looks Greasy

28-year-old "Speed Racer" star Emile Hirsch donned a denim jacket and perfectly quaffed hair curl at a West Hollywood party Thursday (left) -- while Jeff Conaway looked very similar in the same slick style as Kenickie in the 1978 musical "Grease" (right).

Rama-lama-lama-lama-ding-dong.