The reality star played coy as she asked the photographer to hand back her phone in the picture, but we know she's secretly happy to show off her hard work. Why else would she post the photo on Instagram?
"Give me that back you're making me blush! #vegas," Marlo protested.
Whoa, nice obliques, girl!
Marlo manages to pull off the rare combo of sexy and cute in her flattering, black-and-white print two-piece paired with chunky gold jewelry. If that flat tummy isn't enough to motivate you to hit the gym, we don't know what will.
Of course, those icy adult beverages to the left are motivating us to go to the bar instead.
Are you impressed with Marlo's fit physique? Sound off below!