Amanda Bynes is back on Twitter -- and this time that's a good thing.

The starlet, who once used Twitter to fire insults at other celebs, broke her post-rehab silence over the weekend with a message on social media thanking her supportive fans.

"Hi everyone! I'm busy studying at @FIDM but I want to say I love you to my fans! Xoxo Amanda," tweeted Bynes, who is studying at the Fashion Institute of Design & Merchandising in California.

Bynes also deleted several of her controversial -- and confrontational -- past tweets that targeted everyone from Miley Cyrus to President Obama.

In December, the 27-year-old left a psychiatric facility following a very public meltdown.

Last week, she accepted a plea deal in a 2012 DUI case.