Masters Medspa — Irvine, Orange County CA
About Masters Medspa
We are Orange County's premier luxury medical spa — a place where clinical excellence, master-level artistry, and genuine patient care come together. Every treatment at Masters Medspa is designed to help you look and feel authentically, effortlessly yourself.
Meet Our Masters
Click to learn more about each provider
Allison Brewer, NP is a nationally board-certified Nurse Practitioner and master cosmetic injector with over 16 years of experience in the aesthetics industry. She began her career with eight years in the operating room alongside renowned plastic surgeons in Orange County before transitioning to non-surgical aesthetics, where she has dedicated the past eight years to full-time injecting — specializing in advanced techniques including non-surgical rhinoplasty and thread lifts.
As a second-generation injector, Allison was profoundly influenced by her mother, Lynn Audette — a pioneer in aesthetic medicine since the early 1990s. She participates annually in master injecting courses led by esteemed providers from Spain, Italy, Brazil, Canada, Sweden, England, and the United States.
Allison holds a Master of Science in Nursing with a specialization as a Women's Health Nurse Practitioner from California State University Fullerton, where she was a Dean's List honoree and member of the Sigma Theta Tau International Honor Society.
Katherine MacBarron, PA-C is a highly accomplished Physician Associate who honed her expertise working alongside Newport Beach's top plastic surgeons — with hands-on experience assisting in facelifts, liposuction, body contouring, rhinoplasty, and more. She brings an unparalleled surgical precision to the non-surgical world of aesthetic medicine.
Katherine's diverse clinical background spans OB/GYN, plastic surgery, medical aesthetics, and hormone replacement therapy. Her passions lie in cellular health and anti-aging treatments — including hormone and peptide therapy, laser skin resurfacing, microneedling, fillers, and neurotoxins. She is deeply committed to helping patients look and feel their best from the inside out.
Katherine holds a Bachelor's degree in Molecular, Cellular, and Developmental Biology from UC Santa Barbara and a Master's degree in Clinical Medical Sciences and Physician Assistant Studies from Barry University in Miami.
Cheryl Tan, RN is a nationally recognized aesthetic nurse with over 10 years of experience in the plastics and aesthetics industry, and over 8 years in neonatal intensive care. Her work focuses on patient-centered care, using personalized, evidence-based treatment plans to achieve natural and refined aesthetic results.
Cheryl is deeply dedicated to education and mentorship, serving as Regional Trainer for three industry-leading companies: Monarch Aesthetic Services, Laseroptek, and PRX Derm Perfexion. She is also co-founder of Elevé Aesthetics Institute, where she extends her passion for education globally — sharing her knowledge with nurses worldwide and shaping the next generation of aesthetic practitioners.
Cheryl graduated from Loma Linda University in 2009 with a Bachelor's Degree in Nursing.
Tannaz Razavi Armon, RN is a highly skilled aesthetic nurse with extensive experience in advanced laser technologies and injectable treatments. Her clinical background includes significant roles at Cosmeticare and Forever Ageless, where she served as Lead Laser Aesthetic Nurse — performing neurotoxin, dermal filler, and laser treatments while specializing in patient safety and education.
A published author, Tannaz has been featured in DermaScope Magazine and on platforms including Bravotv.com, OK Magazine, and WomensHealthMag.com. She has appeared on Real Housewives of OC and is an active member of the American Society for Laser Medicine & Surgery (ASLMS). Tannaz is a Certified Laser Safety Officer and bilingual in Persian, allowing her to serve a diverse patient population with ease and warmth.
Tannaz holds degrees from the University of Texas Arlington, UC Irvine, and Saddleback College, and is currently pursuing her Doctorate of Nursing Practice (DNP) at California State University Long Beach.
Dr. Chantal Lunderville is a board-certified family physician with a background in holistic medicine. Following her medical training at UCLA and UCSF, Dr. Lunderville focused on women's health and reproductive justice — and through guiding women in their holistic health and wellness journey, found her true passion in aesthetic medicine.
Over the past five years, Dr. Lunderville has expanded her practice to oversee nurse partners, provide training, and empower women business owners in the aesthetic space. Her passion lies in guiding healthcare providers to incorporate scientific research and medical wellness into aesthetic treatments — ensuring clients receive safe, evidence-based, and enduring results.
Macy Mercado is a dedicated Medical Assistant and RN student at Masters Medspa, bringing warmth, precision, and a genuine passion for patient care to every interaction. As a nursing student working alongside our clinical team, Macy is building a strong foundation in aesthetic medicine — learning from some of Orange County's most accomplished providers.
Her commitment to patient comfort and seamless clinical support makes her an integral part of the Masters Medspa experience from the moment you walk through the door.
Our Story
How We Got Started
Masters Medspa was born out of a shared passion between women's healthcare professionals who recognized the need for a more holistic, patient-centered approach to aesthetic medicine. In March 2024, Allison Brewer opened Masters Medspa in Irvine, California — bringing together a team of specialists united by a single belief: that aesthetic treatments, when done well, should enhance who you already are.
Aging is a beautiful process. But the years of environmental exposure, stress, and time can leave us looking older than we feel on the inside. At Masters Medspa, we exist to bridge that gap — to help our patients feel seen, confident, and completely themselves at every stage of life.
What began as a vision for a truly elevated medspa experience has grown into one of Orange County's most trusted aesthetic practices — home to Miss California, reality TV personalities, models, and discerning clients from across Southern California who value precision, discretion, and results that speak for themselves.
Community Commitment
Giving Back
We dedicate a portion of our practice pro bono to women's shelters serving survivors of abuse. Each year, we provide complimentary full-face rejuvenation treatments to help these women rebuild their confidence as they re-enter the workplace and reclaim their futures. It is one of the privileges of this work that we take most seriously.
Our Philosophy
Why Our Approach Is Different
At Masters Medspa, we don't treat in isolation. We treat the whole face — and the whole person. Every new patient begins with a comprehensive assessment of facial balance, skin health, and individual goals before a single treatment is recommended. This is what separates a truly elevated aesthetic experience from a transactional one.
Our team is committed to ongoing education, advanced training, and the highest clinical standards. We use only FDA-approved products purchased directly from manufacturers, and we prioritize techniques that deliver subtle, natural, and lasting results — never exaggerated or overdone.
Master-Level Precision
Every provider on our team is a specialist in their discipline — not a generalist. Allison leads injectables, Cheryl and Tannaz lead lasers, and Kat leads hormone therapy. You are always in expert hands.
Natural Results First
We prioritize full facial balancing and natural outcomes. Our goal is never to make you look like you've had something done — only to make you look like the best, most refreshed version of yourself.
Continuous Education
Our providers train annually with leading aesthetic physicians across the US and Europe — ensuring Masters Medspa always offers the most advanced, evidence-based techniques available.
Transparent & Personalized
Every patient receives a customized treatment plan with transparent pricing before committing to anything. No pressure, no upselling — just honest recommendations designed around your goals.
Ready to experience the Masters difference?
