Entering the room in a flowing red gown, a publicist waits outside the door while a makeup artist trails behind, carrying her heels. Several other officials are also in tow.
It's the beginning of the months-long publicity run for Pitch Perfect 2 and in-between interviews and voiceovers Wilson's hop-scotching between photo shoots.
"I've had to wear lots of dresses today, doing all sorts of photos and magazine covers. I'm doing more modelling these days than acting, which seems a bit off-balance in terms of my skills and abilities. But it's fun. You've got to make it fun."
It's a long way from her first visit to the iconic Hollywood spot more than two decades ago. Aged aound 7 at the time, she never dreamed that she would one day work alongside Robin Williams and Mark Wahlberg, create and star in her own sitcom, walk red carpets and become neighbour to Jake Gyllenhaal.
"When I was a kid my grandma brought me here to Universal Studios and we were on little trams - if you walk outside you can still see them. I remember they were filming Interview with a Vampire with Brad Pitt and Tom Cruise and I saw them filming and was like, 'Oh my God, the movies!'
"You just don't ever think [you'll end up here]. Now, this is where I work. I'll be coming here to watch the movie and there's a huge poster of me. It's pretty surreal."
Watch the trailer for Pitch Perfect 2 below:
Though Hollywood left its mark on Wilson at a young age, the daughter of professional dog handlers was more academic than artsy at school, envisioning a career in mathematics, then studying law.
But after travelling to South Africa to serve as a Rotary International Youth Ambassador, law was relegated to the backburner. Having contracted malaria, Wilson experienced fever-induced hallucinations, one of which involved being an Oscar-winning actress. Coupled with her experience in Africa sparking a desire to become more creative and "focus on entertaining others", the idea inspired her to turn her attention to acting.
Starting in theatre, she wrote and starred in Australian productions including The Westie Mono-logues, then landed television comedies, including Pizza.
The natural next step was heading to Hollywood, where her big break came as Brynn on Bridesmaids, followed by a string of film and television roles, then her own, albeit shortlived, sitcom Super Fun Night.
Yet Wilson admits all she had eyes for as she landed in LA was scoring one gig to prove wrong the naysayers back home.
"I came up from doing theatre in Australia," she says, rolling her eyes, "very traditional - all the classics. Then going into TV and wanting to get into movies, so of course I came to America and my first job was Bridesmaids.
"Now it's been five years and I've done 13 or 14 movies - my goal was just to get into one movie, so that people would respect me in Australia.
"It does seem a bit crazy, because I didn't think I would be a professional actress or that I'd be any good, but it's worked out really good. I should look back more and say, 'Oh yeah, I've achieved quite a bit.' Instead, I'm thinking, 'What other movies can I do?'
"There are a lot of skills I haven't yet shown, like dramatic acting. People have seen the tip of 'improvised comedy Rebel', so to show them the other stuff would be cool and I'm sure I'll get those opportunities in the next few years ... once this movie crushes it!"
That movie is Pitch Perfect 2, the highly-anticipated sequel to 2012's sleeper hit, about an all-girl acapella group.
The film endured a slow start at the box office then went on to become the second highest-grossing musical comedy of all time, behind School of Rock.
Wilson's portrayal of Australian student "Fat Amy" cemented her comical coup, won her numerous awards and scored her more screen time - including a solo number - in the sequel.
Having become a spokeswoman for Jenny Craig and shedding 10kg after Bridesmaids, she was contractually prevented from dropping further pounds while filming the first Pitch Perfect, a rarity for females in Hollywood.
She giggles that she's "fatter in the second one - not deliberately," but reflecting on the role that her weight has played in her comedic success she sees days like today - where her figure is the focus of numerous magazine cover shoots - as a win for women.
"I never thought someone would want me on their cover. Growing up in the western suburbs of Sydney and being a normal-looking girl, I just never thought it.
"But when you become successful as an actress, they start calling ... which is cool, because I'm probably more representative of normal, everyday girls."
Last month, Wilson wore oversized angel wings to the 2015 MTV Movie Awards to protest the size of models in advertising, including lingerie brand Victoria's Secret. "I think one of the messages is that we are all beautiful and sometimes girls look at Victoria's Secret models and think to model themselves after that," she told the New York Daily News after the awards. "I really don't think that is the best. Even though they are called models, they are not the best people to model yourself after, and I would like to encourage other girls to think like that."
Despite her stance, it doesn't mean that her own body image is constantly intact. Since relocating to image-conscious Los Angeles, Wilson has had to become even more comfortable in her own skin and admits it's still a challenge on films like Pitch Perfect, where her co-stars are super-slim.
"I wish [my co-stars] Anna Kendrick or Brittany Snow were here right now, so you could see them next to me. They are so tiny - I am literally three times their size.
"Sometimes it's hard because it's just difficult not to look so massive next to those girls. But at the end of the day, I just am who I am ... at least at lunch I eat whatever I want while they're eating lettuce. Not that they need to, they just eat like that and I eat whatever."
Not quite whatever - in typical Tinseltown fashion she recently discovered she's gluten and dairy-intolerant, meaning her favourite indulgence of pizza has been bumped off the menu. She does still enjoy making "an Australian dessert called pavlova ... although New Zealand sometimes claims it".
Though tastes of Downunder may bring her comfort, it's in Los Angeles where Wilson has slowly found contentment.
Her early days were an adjustment, knowing no one and clueless about where to shop or dine, but success has helped her settle.
"Now Australia's a little foreign, which is weird. I go back, see everyone on TV and go, 'Is that how I sound in America?'
"Australia's always my home, but I feel very comfortable here now. I know where to go and I have lots of friends - they're all in movies, so you don't have normal friends though."
Of course the most significant place-setter has been the purchase of a US$2.2 million, chandelier-adorned home in the Hollywood Hills.
Jennifer Lawrence recently moved out from next door and Jake Gyllenhaal just sold his neighbourhood digs, but various celebs still reside "in the hills".
Despite her professional accomplishments, it was that day that she became a homeowner that marked one of Wilson's biggest accomplishments.
"Australia has a big obsession with owning your own home. That's the Australian dream. So when I made enough money, I went, 'I'm buying a property here.'
"It has a swimming pool and a hot tub and made me go, 'I've made it. I think I'm here to stay.' My family were like, 'Nooooo,' but they visit a lot. They still can't believe it either. When I first started acting they were like, 'Rebel, who would want you in their movie?'
"That's Australia for you - people are pretty harsh. They were like, 'You're not that funny,' and I would say, 'No, I will be.'
"Now when they see me at premieres they can't believe it. My mum will stand with the paparazzi and take photos because she wants some 'nice ones' for her collection. I call her the 'mumarazzi'."
Those photographers aren't always so easy to deal with. Looking back at her five years in the US, her biggest struggle has been adjusting to being recognised and snapped on the street. A trip to the supermarket frequently sees her pursued by photographers and one of her favourite pastimes, visiting Disneyland, now involves escorts and secret doors.
"It's the craziest thing, because you don't think it'll affect you but it affects your day-to-day life. It's so nice that people like you and the work you're doing, but you do become a bit of a prisoner sometimes. You can't go out."
The shift in celebrity gear was felt more so in Louisiana, where Wilson and her co-stars recall being no-names while filming the first Pitch Perfect, compared to the sequel, when they had to avoid going out together.
Although one might expect a cast of 10 young female leads would involve tension, Wilson says reuniting with her co-stars was more a reminder of how much she is living the dream.
"One time one girl threw a KitKat at another, but there wasn't much drama compared to what there could've been. I love the camaraderie. I used to play a lot of team sports like field hockey, softball and cricket - but don't mention that, because it's real geeky - and there's something about being in a unit. Some days I'm like, 'This must be what the Spice Girls felt like,' because you've got all your friends and you're singing, dancing, practising routines.
"To make money by just acting stupid in front of a camera is pretty good, I think."
Pitch Perfect 2 is at cinemas on May 7.
- Canvas
