When Lydia suspects that she could be pregnant, she begs Nate to keep it a secret from Jimmy until she can find out for sure. As Nate makes every attempt to avoid Jimmy at all costs, Jimmy begins to suspect that his best friend is hiding something and makes it his mission to find out what. Meanwhile, Harrison makes his intentions to win Lydia back clear to Jimmy, setting off some not-so-friendly competition. Elsewhere, Nate's complicated life gives Emma everything she needs to write the perfect country song.

Just when things are beginning to go smoothly with Jimmy, Lydia gets a major surprise when her uptight mother, Gammy shows up unannounced. Knowing that Gammy would never approve of her new relationship with Jimmy, Lydia is forced to create an elaborate cover-up, which finds Nate drawing the short end of the stick. Meanwhile, Jimmy wants the chance to prove himself to Gammy, but ends up in an awkward position when an innocent mix-up sends their plan spiraling out of control. Finally, Gammy surprises everyone when she reveals her own little secret.