Miley Cyrus' last two boyfriends have been in their early twenties -- but, in a new music video, she's skewing even older ... and making out with a 26-year-old!

The 17-year-old -- who previously dated Liam Hemsworth, 20, and Justin Gaston, 22 -- gets steamy with "Gossip Girl" actor Kevin Zegers in the Rock Mafia video for "The Big Bang," which just posted online.

This isn't the first time Miley's caused a little controversy with a music video -- her vid for "Who Owns My Heart" was blasted by the Parents Television Council just last month.

Check out "The Big Bang" above, then let us know ...

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