She was also smooching male underwear model Justin Gaston, who was 20 years old.Said Miley's dad, Billy Ray: "He actually reminds me a lot of myself when I was 20 years old." Aw. You're used to this kooky couple by now, but before Megan Fox was the full-grown sexy Shakespearean that she is now, she was an 18-year-old star of the Kelly Ripa vehicle Hope and Faith.That's when she started dating co-star Brian Austin Green, who at the time was 30.

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But it is one of the seminal celebrity underage romances.

Oh, that's right, this couple from four years earlier.

While they dated, Valderrama was 20 and Moore was 16. Of course, the icing on the proverbial cake came when he went on Howard Stern later and bragged that he'd taken Moore's virginity. "But it wasn't like warm apple pie." No wonder that guy is always making a face like someone just punched him between the eyes.

Miley may be willfully sexy now, but back when she was 16 she was battling controversy over that vaguely sultry Annie Leibovitz photo in Vanity Fair.

These Heroes co-stars knew better than to open up about their relationship, because when the two started dating, Ventimiglia was 30. Remember when Hayden was playing the adorable, cherubic 12-year-old daughter of Calista Flockhart on Ally Mc Beal in the spring of 2002?

Milo was in the young professional target demographic of that show, because he was a working actor and also 24.

Okay, so admittedly we didn't really know who these people were before we started looking up names for this slideshow. This story is far too sad to have fun with, as Aaliyah was rumored to have illegally married her mentor Kelly when she was only 15.

But Linda Bollea (formerly Hogan, as in wife of Hulk) was 49 when she started dating this 19-year-old. Seven years later, she was killed in a plane crash.

But she probably wasn't watching it herself: She was just 4 years old.

To be fair, it's not like anybody is saying this particular pairing is completely normal.

Former porn star Gruber is 20, and famed fashion designer Klein is 67. These two, who began dating when Wood was 19 and Manson was 38, wanted us to think they're freaks throughout their years-long on-and-off relationship.