"They noticed him changing two years ago and stayed by his side. But now it's too much," a source tells Us Weekly. "They even took the pictures of him out of their home."
Us Weekly reports Spencer, 26, and Heidi, 23, have become virtual shut-ins at their $7,000-a-month rented L.A house, which is filled with framed covers of magazines on which they've appeared.
"No one ever visits," a local tells Us, and the couple rarely leave. "Heidi sits and stares in the mirror, while Spencer plots and schemes on his projects all day," adds a Pratt source. "He sits on the Internet, watches TV and tries to get press. That is all he does. It's totally sick."