Shahs of Sunset star David Golshan got an unexpected letter from a young fan with a disturbing message, and RadarOnline.com has exclusively obtained a copy.

David, 32, isn't an official cast member of the hit Bravo series, but he's a major player in the first six episodes as a good friend of main cast member Reza Farahan.

It was one of the most sensual scenes in Titanic -- Leonardo DiCaprio's character Jack sketching a naked portrait of Kate Winslet's Rose in the 1997 blockbuster film.

Now, that drawing has been auctioned off for a reported $16,000.

The famous picture shows Kate's character, Rose, seductively lying on a couch wearing nothing but the iconic blue diamond necklace.