We had a feeling that old hand-me-down Porsche Cayenne wasn't going to last long for Miley Cyrus. Two months after being given her mom's old SUV as a Sweet 16 present, Miles is over it for some interesting reasons.

For one, "it was too big and scared her," a source tells E! News. Also, she's pretty serious about going green, especially with a soon-to-be released single on her current album, Breakout, titled "Wake Up America." That song goes a little something like this:

Oh, the earth is calling out
I wanna learn what it's all about
But everything I read's global warming, going green
I don't know what all this means
But it seems to be saying

Wake up America
We're all in this together
It's our home, so let's take care of it
You know that you want to, you know that you got to

Subtle, no? (It's about saving the environment.) So Billy Ray finally woke up and surprised her with a black Prius over the weekend. We gotta hand it to Miley: With all her bike riding and now hybrid driving, it really seems like she's legitimately trying to live green.

—Reporting by Ken Baker

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