Chelsea O'Donnell, 17, was last seen in Nyack a week ago (11Aug15) and a search began on Sunday (16Aug15).

A description of the teen has also been posted on the actress/TV personality's website.

It reads: "She was wearing a black sweatshirt hoodie, dark ripped blue jeans, women’s grey converse sneakers and a black backpack. Chelsea has a large tattoo on her right side of a dream catcher with the word 'Breathe'.

"She left home with her 6 month old therapy dog named Bear. The dog is a 9 lbs brown and black terrier. Chelsea stopped taking her medicine and is in need of medical attention. Any information please contact authorities at 845-358-0206 or 911."

O'Donnell has also posted a photo of Chelsea and her dog on her Twitter account, suggesting the teen may be in New York City.

Chelsea was adopted by O'Donnell when she was married to her first wife Kelli Carpenter from 2004 to 2009. It has not been made clear what medication the teenager needs.