If I was going to go mmmm.... Trek actor/ress though...
I'd have to say Jolene Blalock (Subcommander T'Pol, Vulcan attache to the United Earth (not United Federation of Planets) starship Enterprise, NX-01.
Followed by, funny enough, Connor Trinneer (Commander Charles "Trip" Tucker III, chief engineer USS Enterprise NX-01, and Subcommander T'Pol's romantic interest)
I recently got Purple Fraggle into ENT, and we've been debating who's hotter, Trip, or Lt. Reed.