Hicks was born in Greenwich, a town of 60,000 on the southwest tip of Connecticut that's a favorite spot for hedge-fund headquarters.
She was a model, actress, and lacrosse player as a child, before getting her English degree at Southern Methodist University.
Hicks didn't intend on playing such a large role in a presidential campaign, instead falling into the gig through a job at the Trump Organization.
But she now finds herself as one of Trump's youngest advisers, serving as his new interim communications director in the White House.
And Hicks has been with Trump — to use his words — "from the beginning." She stuck on his campaign through several staff revamps, including two high-profile changes at the campaign-chair position.
Here's what we know about Hicks.
Hicks met patriarch Trump and quickly "earned his trust," Ivanka Trump told The New York Times for a June 2016 profile on the spokeswoman.
Source: New York Times
In January 2015, Trump called Hicks into his office on the 26th floor of Trump Tower and told her she was joining his presidential campaign. "I think it’s 'the year of the outsider.' It helps to have people with outsider perspective," Hicks said Trump told her.
Hicks didn't have any political experience, but her public-relations roots run deep. Both grandfathers worked in PR, and her father, Paul, was the NFL's executive vice president for communications and public relations. He was also a town selectman from 1987 to 1991. Greenwich proclaimed April 23, 2016, as Paul B. Hicks III Day.
Hicks started working on what would become Trump's campaign five months before Trump announced his presidency, after he famously rode a golden escalator down to the lobby of his tower on June 16, 2015.
That makes Hicks the campaign staffer who has persisted in Trump's inner circle the longest. She outlasted his first campaign manager, Corey Lewandowski, and several senior advisers.
People close to her describe Hicks as a friendly, loyal fighter. Trump has called her a "natural" and "outstanding."
While reporters who have worked with Hicks say she's polite, they have expressed frustration that she was often unreachable on the campaign trail, not responding to requests for comment, or denying access to the candidate.
She said her mom, Caye, told her to write a book about her experience with Trump, like "Primary Colors," the fictional novel depicting President Bill Clinton's first presidential campaign. "You don't even know," she said she told her mother.
During the campaign, Hicks spent most of her days fielding reporters' requests and questions — even reportedly taking dictation from Trump to post his tweets.
During the campaign, Hicks stayed in a free apartment in a Trump building, though she'd often go home to her parents' house in Connecticut when she could.
These days she's in DC. Trump named her his assistant to the president and director of strategic communications in December.
It's been said she can act as a sort of Trump whisperer, understanding his many moods and professionally executing what needs to be done. She still only calls him "Sir" or "Mr. Trump."
"If the acting thing doesn’t work out, I could really see myself in politics," Hicks told Greenwich Magazine when she was 13. "Who knows."
In June, the White House released salary info for 377 top staffers. Hicks gets paid the maximum amount that any of Trump's aides receive: $179,700.
Hicks is making as much as Trump's former chief of staff Reince Priebus, chief strategist Steve Bannon, former press secretary Sean Spicer, senior counselor Kellyanne Conway, policy adviser Stephen Miller, and communications official Omarosa Manigault.
Some family members and friends have expressed concern that Hicks is so closely tied to a president whose policies and statements are unpopular with a significant number of Americans, but are confident that she'll come through unscathed.
"There is just no way that a camera or an episode or a documentary could capture what has gone on. There is nothing like it," Hicks told Marie Claire in June 2016. "It is the most unbelievable, awe-inspiring thing."
In August, Trump asked Hicks to be the new interim White House director of communications, a job that Michael Dubke, Sean Spicer, and Anthony Scaramucci held and left in Trump's first six months in office. The White House will announce who will serve in the job permanently "at the appropriate time."
The 28-year-old Hicks is the youngest communications director in history.
