Embattled Amanda Bynes has threatened to take legal action against two media outlets after editors questioned her bizarre behaviour after publishing photos of the actress walking around New York with a shirt over her head.

The Hairspray star has become a gossip column regular in recent months thanks to her driving and legal woes and eccentric behaviour.

She raised eyebrows in the Big Apple again on Tuesday when she was snapped exiting a McDonald's in Times Square with a blue button-up blouse covering her head and face.

The odd pictures were posted online on both UsMagazine.com and PerezHilton.com, prompting the celebrity blogger to suggest the actress was "mentally unstable".

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Bynes was not happy with the criticism and hit out at the publications in a Twitter post on Thursday, claiming she was going to take them to court.

"I'm suing @usweekly & @perezhilton for continuing to act like I'm doing something wrong by tweeting and walking to photoshoots. F**k you!" she said.

However, the 26 year old quickly got over her fury - minutes later, she tweeted fans about her upcoming fashion projects, adding: "Check my twitter for updates on my clothing and perfume line plux pix (plus pictures)!"

- WENN

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