A surprise guest on Jordan Rodgers and JoJo Fletcher's Instagram Live session turned out to be a real d*** ... 'cause a complete rando decided to crash the party in his birthday suit.
The wild moment went down as the married "Bachelorette" couple was interacting with their fans on social media this week ... when they accidentally allowed the wrong person into the stream.
It's unclear who was supposed to join the interaction, but it's safe to say they were not expecting to come face-to-face with a dude's family jewels.