RIHANNA'S ROOF TOP STALKER GETS SENTENCED!

Here's a good lesson: don't creep around Rihanna's roof ... or you'll find yourself in a buttload of trouble.

TMZ broke the story ... Rihanna obtained a restraining order against a man named Robert Melanson after he was captured skulking around her roof on June 17th.

In addition to being hit with a restraining order, Melanson was charged with criminal trespassing.

Now the buttload of trouble part -- Melanson pled no contest this week to the trespassing charge, and was subsequently sentenced to time served in jail (6 days), 3 years probation, $344 in fines, and one year of mental health treatment.

It's no prison sentence ... but still, don't creep on people's roofs.

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