Amanda Bynes just pulled a Rihanna ... with her hair!

The actress debuted a brand new 'do last night on Twitter, posting a photo of her with half her head shaved. 

While RiRi and Avril Lavigne have both rocked the look, Bynes revealed her half-shaven inspiration was actually a different singer: Cassie.

"I buzzed half my head like @cassie! No more old photos! This is the new me! I love it," she tweeted along with the photo. 

It's definitely a different look, but an improvement over the mess of extensions she was sporting on her head before.

The move is only the latest in a string of strange behavior from the 27-year-old, who has started bashing anyone online who uses unflattering photos of her or writes unfavorable stories about her.

Check out some of the Amanda-approved photos from her Twitter page above.

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