It seems like every time we blinked Vanessa Hudgens was wearing a different outfit at the 2017 Billboard Awards, which the actress co-hosted last night. And while this feat alone is pretty impressive, considering the number of mornings we struggle just to find a clean shirt to wear, what was even more impressive were those abs popping out in her Cher-inspired outfit.

Hudgens isn't the only celebrity making waves with a jaw-dropping midsection. Zac Efron's recently unveiled abs as a result of his prep for his new movie, Baywatch, are some of the most chiseled we've seen in a long time. (His co-star Alexandra Daddario was just as impressed.) And if you're thinking to yourself, "Hey, didn't those two used to date? Are they having an ab-off?" you're not alone. We've determined Vanessa Hudgens and Zac Efron must be having a battle of the exes, abs edition.

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Both celebrities are sporting some seriously toned abdominals these days. Upon taking a closer look, however, the two sets of abs aren't alike. But just as the former couple taught us back in their High School Musical days, how the super popular guy and the new girl were able to not only fall in love, but win the school singing contest or whatever the hell happened, two very different styles of ab workouts can still get you a shredded core for the summer.

A close look at Hudgens' abs reveal how lean but not incredibly muscular they are. That isn't to say her core isn't ridiculously strong, however. These abdominals come from a lot of stability and anti-rotation work. Add this cable-core press and this awesome plank variationto your core routine if you're looking to stabilize and lean out your midsection.

Efron's are a different story. He's got some serious muscular bulk that comes from adding weights to your core routine. This 3-move circuitwill not only help trim fat off your midsection, it'll add that muscular bulk that makes abs like Efron's pop.

While the two are long-past their puppy-love days of singing and dancing through the hallways of a high school, they are both nailing the high notes when it comes to their core regimen. We have a hard time determining a winner here when the two different styles are obviously so effective. So for now, we'll call it a draw. You can't go wrong with either. Lifeguard or Cher? Popular basketball star or sweet shy girl? To each his own.