The year was difficult for Spears, who earlier this month said she took a little time to focus on caring for herself.
During her post, people and other sites reported that the star had registered in a facility to seek "comprehensive wellness treatment."
In January, the singer said she was retiring from her career and from staying in Las Vegas to help her father who is dealing with health problems.
Earlier this week she mentioned her personal struggles in the message of her supporters after speculation about the absence of the pop star from the spotlight.
"My family has been experiencing a lot of stress and anxiety lately, so I just needed time to do it," Spears said at Instagram.
She added, "You may not know this for me, but I'm strong and I advocate for what I want!"
Spears demanded "a little privacy to cope with all the difficult things life throws me along the way," and said he would return "very soon."
Later, Spears published a video about himself, thinking, carefreely, noting, "Who knew the stress would be a great weight loss of 5 pounds.