Miley Cyrus is used to making hearts race, including her own.

Cyrus discloses in her new autobiography, “Miles to Go,” that she has a heart condition called tachycardia.

Tachycardia causes her resting heart rate to beat faster than normal, she says.

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“The type of tachycardia I have isn’t dangerous. It won’t hurt me, but it does bother me. There is never a time onstage when I’m not thinking about my heart,” the 16-year-old “Hannah Montana” star writes.

And as for the fellow teen star who makes her heart race?

Apparently, it's Nick Jonas of the Jonas Brothers, about whom she wrote “7 Things I Hate About You” when their teen fling was flung out.

Still, she says the two have patched things up, and that he is her "favorite Jonas."

We're so more into Joe.