Alana Stewart -- Turn Off the Faucet!

Farrah Fawcett's BFF Alana Stewart has had it up to here with her neighbor.

Stewart claims in a lawsuit her neighbor habitually over-waters her foliage without proper drainage. Translation -- the neighbor waters too damn much and it constantly runs over and floods Alana's property.

Stewart, ex-wife of both George Hamilton and Rod Stewart, complains mud and garbage flows onto her property, her walkways and fence have eroded and discolored, and "an increasing colonization of harmful mold" has built up inside her house.