According to O'Donnell's note on her website Tuesday, her daughter was last seen Aug. 11 in New York with her black terrier dog named Bear.
chelsea and her dog bear - last seen in nyack ny - may be in NYC - please call 845-358-0206 or 911 pic.twitter.com/1jXbNxravZ— Rosie (@Rosie) August 18, 2015
O'Donnell says that Chelsea was "wearing a black sweatshirt hoodie, dark ripped blue jeans, women's gray converse sneakers and a black backpack."
It seems that Chelsea ran away of her own volition, since the message on her website explains, "She left the house..." O'Donnell also noted that "Chelsea stopped taking her medicine and is in need of medical attention."
O'Donnell's publicist noted that Chelsea suffers from a mental illness.
O'Donnell has also been using Twitter for any information, and fans and friends have come out in droves to support her.
@Rosie Sending you so much love and support! We are here if there's anything we can do to help.— Jordan Roth (@Jordan_Roth) August 18, 2015
@Rosie OMG Rosie! You must be beside yourself with worry! Sending you lots of positive thoughts! Please keep us posted!— Tracy (@tracers_) August 18, 2015
Oh, @Rosie ... Prayers going up now and until there's news. So sorry to hear of this. Praying for a hedge of protection around your dearest.— E D E N (@BrotherEDEN) August 18, 2015
@Rosie we hold you and family close in our hearts. We ask the universe for intervention for a safe return! Our love!— Raymond & Kathleen (@KandRdawson) August 18, 2015
@Rosie everything is going to be okay! Praying for you! Wishing I could do more. Stay Calm. Xoxo— luna (@IamJahnaGarcia) August 18, 2015
Police are also searching for the teen in the New York area.
O'Donnell has five children. She is currently going through a heated divorce with her estranged wife Michelle Rounds. No word yet if the family drama played into Chelsea's decision to leave the home.
Our thoughts and prayers are with O'Donnell and her family during this time. Anyone who has any information about Chelsea can call the authorities at 845-358-0206 or call 911.
UPDATE: RadarOnline has obtained texts between Chelsea and her biological mother Deanna Micoley, as well as O'Donnell and Micoley, going back months. It is clear that Micoley is desperate for a relationship with the teen, and O'Donnell is trying very hard not to come between them — but at the same time is frustrated with Micoley's accusations of adoption fraud. Micoley said Chelsea mentioned wanting to come visit her in Wisconsin, but has not heard from her since she's gone missing.
UPDATE: O'Donnell has announced her daughter has been found.
chelsea has been found and is safe in police custody - thank u all for the help and light #missingchildren— Rosie (@Rosie) August 18, 2015
Det. James Coyle of South Nyack-Grand View Police Department told USA Today that officers are en route to pick up Chelsea in New Jersey and that she is in good health.
And you'll see personalized content just for you whenever you click the My Feed .
SheKnows is making some changes!