UPDATE: Rosie O'Donnell announced on Twitter this evening that her daughter Chelsea has been found:

Earlier today, Rosie O’Donnell tweeted that her 17-year-old daughter Chelsea O’Donnell had gone missing, with a link to a post on her website sharing more details about her disappearance.

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"Nyack, New York police authorities have been looking for her in the Rockland County area since Sunday, August 16,” the post reads. "She was last seen Tuesday, August 11. 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.”

O’Donnell also shared a photo of Chelsea and her dog, along with a number to call if anyone has any information.