EXCLUSIVE

Richard Simmons is still MIA ... nearly a year after he was last seen, and there are no signs of XMAS or even life at his home.

His friends are more worried than ever. They haven't heard from or seen him since January 11. He hasn't been to his exercise studio in 6 months.

There are no XMAS decorations at his Hollywood Hills house. Friends are not allowed to visit. A housekeeper seems to stand guard whenever anyone tries to enter.