Vivienne Rose O'Donnell, Rosie O'Donnell, Chelsea Belle O'Donnell and Blake Christopher O'Donnell attend the 5th Annual Rosie's Theater Kids Spring Benefit at The Alvin Ailey Citigroup Theater on May 17, 2015 in New York City. Credit: Ben Hider/Getty Images

UPDATE: Rosie O'Donnell's missing daughter, Chelsea O'Donnell, has been found. "Rosie wants to thank everyone for their help, especially the South Nyack, New York, and Barneget Light, New Jersey, police departments. Her daughter Chelsea O’Donnell has been located by the police and is safe in their custody," her rep told Us Weekly late Monday afternoon.  According to TMZ, Chelsea and her dog Bear were found by authorities in Barnegat Light, a town located on the Jersey shore, roughly 130 miles south of Rosie's home. TMZ reports she was located by pinging a cell phone she'd used. 

Rosie also tweeted that her 17-year-old had been located following her alarming post earlier in the day. "Chelsea has been found and is safe in police custody - thank u all for the help and light #missingchildren," the comedian tweeted.

Original story continues below:

Rosie O’Donnell’s 17-year-old daughter, Chelsea O’Donnell, is reportedly missing. The former View co-host posted an alert on Twitter and her website on Tuesday, Aug. 18, stating that Chelsea and her dog Bear were last seen on Tuesday, Aug. 11, and that authorities have seen searching for the teen in Nyack, New York — where O'Donnell and her family have a home — since Sunday.

According to the post, Chelsea is described as last seen wearing a black sweatshirt hoodie, dark ripped blue jeans, women’s gray converse sneakers, and a black backpack. She has a large tattoo on her right side of a dream catcher with the word “breathe.” With her is her 6-month-old brown and black therapy dog named Bear.

“Chelsea stopped taking her medicine and is in need of medical attention,” the post reads. “Any information please contact authorities at 845-358-0206 or 911.”

Rosie also tweeted out a photo of her daughter and Bear on Tuesday with the caption: “chelsea and her dog bear - last seen in nyack ny - may be in NYC - please call 845-358-0206 or 911.”

“Chelsea, like millions of people, lives with mental illness. It has been a difficult road for Chelsea and her family, and they just want her back safe," Rosie's rep tells Us Weekly in a statement.

Chelsea is Rosie’s daughter with her ex Kelli Carpenter, with whom she shares 3 other children. The comedian also shares 2-year-old daughter Dakota with estranged wife Michelle Rounds.

Story developing.