Hannah Brown was chosen as the next The Bachelorette star for many reasons, but according to an ABC executive, her unpredictable nature was a major one.

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Hannah was announced as The Bachelorette's upcoming fifteenth-season star during the finale of Colton Underwood's The Bachelor edition.

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However, some fans were shocked to discover ABC had selected Hannah over Tayshia Adams, Hannah Godwin or Caelynn Miller-Keyes -- especially since the Alabama beauty queen didn't even make Colton's Top 4 bachelorettes.

"That's true," ABC reality chief Robert Mills acknowledged during an interview with The Hollywood Reporter. "I never thought about... But they all were close."

In fact, Mills revealed there was actually a fifth woman in contention for the crown and Bachelorette title.

"This is similar to when Colton was named the Bachelor and I was asked, 'Why Colton and not [Blake Horstmann] or [Jason Tartick]? I said then that it was basically a three-way tie and really a tough decision. And this was the same thing. This case was basically a five-way tie," Mills explained to The Reporter.

"We met with Hannah B., Hannah Godwin [or Hannah G.], Tayshia Adams, Caelynn Miller-Keyes and Demi Burnett."

All five women competed for Colton's heart and carried drastically different storylines throughout the season.

While Demi seemed young, fearless, brash at times, and very open about her sexuality, an arguably more mature Tayshia told Colton she had one serious boyfriend in her life and it turned out to be her husband who ultimately cheated on her.

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Tayshia therefore has the life experience of being brokenhearted and divorced.

"They were all great," Mills said of the ladies, "but there was something about Hannah B."

So what made producers choose "Alabama Hannah," who also nicknames herself "the beast" and a "hot mess?"

"Part of it was that she thought she was the dark horse, so she came in and had nothing to lose, saying, 'I don't know, I'm just going to be myself,'" Mills recalled.

"There was just something different that we hadn't seen in a Bachelorette before. Very kind of charming and goofy. When she had her intro video for The Bachelor and she said, 'I'm Hannah -- all aboard the hot mess express!', you think that's probably just shtick. And then we figured out, no that's actually true."

Hannah may bring an element of unrefinement to the show, as she is not rehearsed or polished, but Mills anticipates her honesty and sincerity will make her special and entertaining as the Bachelorette.

For example, Hannah was given the opportunity to meet five of her bachelors and hand out her first rose.

Not only did Hannah scramble to figure out where to stand on the stage and what to say, she also didn't know how to pin a rose on a man's lapel.

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"Looking at the response, it feels like it was all over the map. I think some people thought, 'Oh my gosh, how is this person going to be the Bachelorette when they seem to really not know what to say or where to stand or what to do?'" Mills reasoned.

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"And then there are people who said, 'We've never seen this before and it seems endearing and charming.' And I was in that camp. I think it's very easy to teach somebody how to pick up a rose or say a name, but you can't fake the natural sort of charm and nervousness and everything that she had, and I thought that was really, really great."

Hannah's sense of humor shined through her performance as well when she announced to the live audience during Colton's finale her rose recipient was going to be the hardest decision she had to make all season.

"Hannah is just very different and fun, and I think people are going to really like spending a lot of time with her," Mills told The Reporter.

"When it's going good, she's going to let you know, and when it's going bad, she's going to let you know. And that's going to be great to see."

Hannah's season of The Bachelorette began filming on Saturday and will air on Monday, May 13 at 8PM ET/PT on ABC. The identities of her bachelors have already been announced.

Mills predicted the premiere episode will have "84 minutes worth of great material."

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