'Love & Hip Hop: L.A.' -- Soulja Boy Will Save Our TV Show

Soulja Boy's getting a heavy dose of reality ... TMZ has learned the "Crank That" rapper's just been added to the cast of "Love & Hip Hop: L.A" -- in a last-ditch effort to pump some life into the show.Sources close to production tell us ... the…

Samantha Morton Samantha Mumba Sanaa Lathan Sara Foster