'Dancing With The Stars' -- Pam Anderson & Kirstie Alley Make Diva Demands

"Dancing With The Stars" is not even one week into the competition but all-star contestants Pam Anderson and Kirstie Alley are already laying down unique demands behind-the-scenes ... TMZ has learned.

Sources close to the production tell us ... Pam requested her trailer be fully stocked with cases of bottled coconut water called Beyond. Not so crazy, you say? Well the brand is imported from Australia ... and almost impossible to find in the U.S.

Meanwhile, we're told Kirstie REFUSES to eat the craft service food provided by "DWTS" ... and instead chooses to stick to her custom designed diet program Organic Liaison -- which gets hauled in for her daily.

FYI -- Kirstie's rep tells TMZ ... the actress lost 100lbs on her frou-frou diet and is committed to sticking with it ... and adds, "Steve Jobs didn't listen to music on a Zune."