Those legs sure look long and thin thin thin to me. I'm not saying she's too thin, just thinner than she used to be, that's for sure. Whitters has taken to wearing super short shorts lately, even since she honed those thighs. Love the flat ankle boots she's wearing, above.
But this outfit would have looked better if she hadn't paired the top with shorts you'd normally wear to bed. They're part of a lingerie set, aren't they? Not for public Whit.

Do you think she's lost weight since The Hills?

She recently said to OK! Magazine "I'm definitely not trying to lose any weight - just to be healthy. I learnt from [former trainer] Donny Connelly to focus on being strong, not just skinny."
"When it comes to food I'm a big snacker. If I don't constantly have energy from food then I get in a bad mood."