Well, I don't wear a belt with my high-waisted jeans because I don't want to draw too much attention to that area. I don't really have the torso length for high-rise, but I wear 'em anyway, only with a low-contrast top and semi-tucked (not fully tucked, which REALLY draws attention to the waist!). A belt would just add a focal point and extra bulk to an area that isn't my best feature, ya know? Plus, the one glorious bonus of high-rise jeans is that THEY DON'T SLIDE DOWN, even without a belt!
FWIW, I don't see any of the sweet young trendy things wearing belts with their high-rise jeans. I don't think you're supposed to, this time around.