updated 12/07/2011 AT 5:30 AM ET
•originally published 12/06/2011 AT 6:00 PM ET
“Kim has been to rehab more than once before,” says the source, “but every time is a new time, and everyone just hopes this sticks and that she gets the help she needs. It’s serious.”
Richards has been “erratic. Everyone was really worried about her,” says the source, who adds that Richards is not living with Ken, the boyfriend who was introduced as her love interest this season.