has herself a new hairdo -- and it may be one of her wildest looks yet!

The singer, who turns 25-years-old today, showed off a bold new look on her Twitter page Tuesday night -- showing her getting some crazy gold studs glued on the side of her head.

"It's happening" she tweeted ... but has yet to post a follow-up photo of the finished look.

In her short few years in the limelight, the singer has had a wild array of crazy hairdos though -- check out all of her wacky looks above.

What do you think? Sound off below!

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