Move over Kylie! Miley's lil sis, Noah Cyrus, is all grown up -- at 15!

Now that Kylie Jenner is officially 18 years old, Noah is set to steal her thunder! She attended Kylie's birthday bash on Sunday night in this interesting new look...

Feeling kind of sus

Happy birthday babe #happy18thkylie

ONTD, do you think Noah will be able to dethrone Kylie Jenner as the new inappropriate teen of Hollywood?

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