Miley Cyrus and her 20 year-old boyfriend may be on the outs

16-year-old Miley Cyrus and her 20-year-old boyfriend Justin Gaston aren’t doing so well, according to Fox News’ Pop Tarts. Miley recently refused to confirm to Ellen DeGeneres that Gaston was anything more than her friend, but she was all giggly and acting like a 10-year-old with a crush. It didn’t seem like she was staying mum on the topic because there was trouble in paradise. Which reportedly there is: Justin spent the night before Miley’s sweet sixteen at a party for Christian Audigier’s daughter, where he flirted with a bunch of girls sans shirt. And to clarify, I mean that Justin was without his shirt, not the girls.

Justin Gaston has certainly attracted a lot of attention thanks to being the older beau of tween sensation Miley Cyrus, but is the 20-year-old enjoying his new found fame a little too much?

Gaston got his groove on Saturday night at Christian Audigier’s daughter Crystal’s birthday bash at Hollywood hotspot the Kress, sans Cyrus on the eve of her own Sweet 16. The professional underwear model caused a stir by appearing in Audigier’s rooftop fashion show but according to our insider, Gaston ran around shirtless after his strutting duties were over.

“He was flirting and definitely wasn’t acting like a guy with a girlfriend,” said our source, adding that Gaston approached a bunch of gorgeous gals without his shirt and had his pants uber low.

Despite the age gap between Miley and Justin, the “Hannah Montana” star’s father is (or at least was) very supportive of the young romance and told Tarts last month that Gaston was “a great and really talented guy.”

[From Fox News’ Pop Tarts]

Something tells me this isn’t going to be a long-term relationship. There’s a significant age difference between Miley and Justin, at least considering the life stages they’re each in. Miley’s gotten a ton of subtly and not-so-subtly negative press since she started dating the older guy – who she admits she has sleepovers with. And then she acts all innocent. If I were her I’d break up with Justin sooner rather than later. Being associated with the guy isn’t helping her image, and she should probably be dating someone a bit closer to her own age at this point in her life.

Here’s Miley with her mom and sister at the 2008 American Music on Sunday. Images thanks to WENN.

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