We're not sure what's going on with Khloe Kardashian and estranged hubby Lamar Odom's marriage, but we do know this: Khloe has been hitting the gym like crazy since the news broke that Lamar was cheating on her and battling an alleged drug addiction.

Over the weekend Khloe and little sister Kendall posted these photos of themselves working out, and Khloe wrote, "KhloMoney and Kenya getting it in in the gym, stunna style!" Kendall added, "action shot! KhloeMoney workin on that booty #GetItGirl"

Not like Khloe really needs to do that much work on her derriere, but we did notice that she's slimmed down even more -- her legs are almost as slender as Kendall's!