'Million Dollar Listing' Star Josh Altman -- They Call Me Flipper

"Million Dollar Listing" star Josh Altman practices what he preaches ... he buys good real estate, sells it and makes a killing.

Altman just sold his house above the Sunset Strip for $3.58M. Truth be told ... it's not the prettiest house we've ever seen. Dare we say it's butt ugly. Nonetheless ... he bought it last year for $2.3 mil.

Josh only dumped $17K into the house and he didn't have to pay a real estate commission ... so he cleared well over a million bucks in 270 days.

Did we say the $17K was like putting lipstick on a pig.