Brody Jenner was in for a big surprise after landing in Thailand for the annual family vacation on Sunday's "Keeping Up with the Kardashians."
The 30-year-old accidentally walked in on Kim Kardashian, nearly naked, as her assistant was taking some sexy pics of her for her new "Selfie Book" for hubby Kanye West.
Check out the video above to see the step siblings' hilarious reactions!
But it didn't stop there, the "Hills" star walked away extremely flustered and stopped by his brother, Brandon Jenner's, room to explain the awkward encounter.
Check out the clip above to see what Brody says when Brandon's wife Leah asks if he got "turned on"!
Yep -- Jenner was accidentally aroused by Kim, who is his step sister, and told Leah and Brandon that he got a "half chub" from seeing the 33-year-old in the see-through wet, white dress.
It was only a matter of time, though. Kim spent the majority of the episode taking sexy pictures of herself for Kanye ... instead of actually living in the moment and enjoying the extravagant family vacation -- which included a private fire dance performance.
Wonder how Kanye will feel about everything?
What do you think about the sexual encounter? Tell toofab in the comment section below!