Peta Murgatroyd has been showcasing her growing baby bump a lot these past few months, but her latest snap might be her sexiest yet. On Thursday, the expectant mother posted a selfie on Instagram that shows her in nothing but a bra and thong. "Oiling this buttercup up 👶🏻 33 weeks," she wrote. Peta and her fiancé, Maksim Chmerkovskiy, first announced that they were expecting a baby boy back in June and haven't been shy about documenting her pregnancy ever since. Maksim even gushed to POPSUGAR about how excited he is to raise their son. "She's the best woman I know, after my mom," he said. "I cannot wait to be incredible parents with her and have that joint adventure."