Sapp's Massive Head Larger Than It Appears

If voting were up to the cast and crew of "DWTS" -- we're told Warren Sapp would be the first one to go.

Our spies at "DWTS" tell TMZ Sapp may have big personality when the cameras are rolling, but his big head and man-diva attitude are causing problems behind the scenes.

We're told Sapp talks down to everybody (especially the guy dancers and production assistants), yells at people and consistently walks out of rehearsals with partner Kym Johnson.

Move ovah, Shannon Elizabeth!