On Tuesday, she kicking things off with a fun selfie showcasing her long, pink locks and septum piercing. Sporting a long-sleeve white T-shirt and a pink beaded necklace in the mirror pic, Bynes captioned the post with a kissy-face emoji.
The 33-year-old actress also posted the selfie on her verified Twitter account, writing alongside, "Hey guys! I'm on instagram now!"
It's her first post since sharing a photo in June at her graduation ceremony from the Fashion Institute of Design and Merchandising in Los Angeles.
ET confirmed at the time that she was still living at an inpatient mental health facility. According to multiple outlets, she reportedly checked herself in back in March due to a stress-related relapse.
A friend of Bynes' told ET in June that Bynes "got a day pass because she's been doing well enough in treatment" -- enabling her to attend the graduation ceremony. "She's in a good place and was very happy to graduate," the friend added.
"I love Amanda, she's like [my] little sister. She's so fearless," he shared. "I remember her being on set, she told me, 'Hey Kel, I wanna do the physical comedy that you do.' So I used to show her little tricks to do that would make her comedy just awesome."
When asked if Bynes might make an appearance on the All That reboot, which premiered in June, he shared that he was all for it.
"That would be crazy! We really want her to do a cameo in All That. We've been talking about that," Mitchell revealed. "So, Amanda, come on, girl! Call ya brother up!"