Warning: This article contains spoilers from Season 4 of "Hart of Dixie."

The CW's hit TV show "Hart of Dixie" dealt with one of its biggest challenges yet: having Rachel Bilson's and Zoe Hart's pregnancy match up in an organic way.

Hiding a pregnancy is nothing new, but having it make sense with the storyline is a bit tricky.

On the Season 4 premiere of "Hart of Dixie," which took place on Nov. 15, Bilson's Zoe visited the doctor trying to cure an apparent "illness." Zoe finds out she is pregnant, which is the result of her actions with her on-again, off-again relationship with Wade (Wilson Bethel), according to TV Line.

Zoe's pregnancy had to be sped up for the show because Bilson was pregnant in real life, but Bilson's real-life pregnancy will not hinder "Hart of Dixie."

Show creator Leila Gerstein weighed in on Bilson's Zoe in an interview with TVLine.

"Rachel being pregnant and the decision to write her pregnancy in definitely became the creative choice that fueled what her and Wade's relationship was," Gerstein said. "If that character got pregnant, that's it. That's going to be the most important thing that's ever going to happen to her, and her and Wade."

Gerstein says maybe she would have had Zoe pregnant later on, but something else great came up.

"But to know that I had to write her pregnancy into the first episode because she was already six months pregnant," Gerstein said. "We really just had to expedite things. It just makes a very clear story. It was very clear to me the second that I knew she was pregnant, they're going to have sex, because I'm not going to have her have someone else's baby."

Bilson's pregnancy puts her in line with other working-mom actresses. For some TV shows, it worked. Meanwhile others decided to get creative. In "How I Met Your Mother," Cobie Smulders and Alyson Hannigan's pregnancies were hidden by large props, E! Online reported. "Scandal" settled on camera angles and large coats for Kerry Washington's Olivia Pope. But for Hayden Panettiere in "Nashville," the pregnancy was written into the show.

Bilson's is the second pregnancy on "Hart of Dixie."

In Season 3, the show saw Jamie King's Lemon hiding her baby bump by keeping the character off-screen for most of the episodes, The Hollywood Reporter noted. Gerstein could not take a similar approach with Bilson, who is the lead on the show, so it had to be written in.

"Once I made the decision to write in Rachel's pregnancy, it was clear that this was going to expedite Zoe and Wade being together," Gerstein said. "It was going to put their relationship on the fast track because [things] happen in life, and this was something that happened, and now they are going to have to figure it out. They don't have time for the back and forth anymore; they have to figure it out," The Hollywood Reporter confirmed.

Gerstein has learned that having a baby and becoming a parent is something that will cause you to freak out, but force you to become an adult.

"You have to cut through the bullsh-t. You have to grow up. Because from the moment you find out, you have, what, seven-and-a-half months to figure out how to be a grown up and take care of someone else?" Gerstein said to TVLine. "There's not going to be time for that, 'Will they or won't they?' They're going to have to figure it out really fast, because someone else is going to be dependent on them."

The next episode of "Hart of Dixie" will air on Jan. 9 at 8 p.m. Watch a promo below.

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