Gretel Killeen: From Big Brother to The Traitors Host

More than two decades after she first welcomed Australia into the Big Brother house, Gretel Killeen is back in front of the cameras — this time as the host bringing The Traitors Australia to screens in 2025. In between came a career most TV personalities would struggle to map: best-selling books, a UNICEF ambassadorship, The Masked Singer, and a documentary series (Gretel Killeen’s official biography).

Born: 3 February 1963 (Wikipedia) · Known for: Original host of Big Brother Australia · Big Brother tenure: 2001–2008 (Seasons 1–7) · Current role: Host of The Traitors Australia (2025) · Children: 1 daughter (Tess Killeen Stern)

Seven quick facts, one pattern: every major chapter of her career has been a reinvention — journalist, reality host, author, comeback host.

How did Gretel Killeen become famous?

Killeen’s route to fame was not a straight line: she started a law degree, found comedy by accident and spent years in media before reality television turned her into a household name.

What was Gretel Killeen’s career before Big Brother?

• Left law studies after what her biography describes as an accidental comedy performance while reading a serious poem (Gretel Killeen’s official biography).
• Built a media career across radio, television and print journalism, including work as a journalist and weather presenter.
• Was already working in media when the call came about a new reality format called Big Brother.

She did not expect the call. Killeen told news.com.au she assumed she was too old and not blonde enough to host the show, and dismissed the idea with the thought “there’s no way they’re gonna want me” — while also describing the eventual job, hosting a large live reality program, as an unusual opportunity for a woman on Australian television at the time (news.com.au, Australian entertainment desk).

The pattern: Big Brother didn’t pick a polished celebrity; it picked a quick-thinking writer-comedian who had already spent years learning to think on air. That foundation became the defining quality of her hosting style.

Who was the original host of Big Brother?

The answer is simple: Gretel Killeen. She was the face of Big Brother Australia before reality TV had a playbook.

How long did Gretel Killeen host Big Brother Australia?

• Hosted the first seven seasons of Big Brother Australia — from the 2001 debut to the end of the original run in 2008 (Wikipedia’s Gretel Killeen profile).
• Also hosted Celebrity Big Brother Australia in 2002.
• Became a household name during that run and remains the host most Australians picture when they hear “Big Brother”.

Seven seasons in the host’s chair made live eviction nights an appointment for viewers around the country. What this means: Killeen didn’t just present the show — she personified it, and the role reshaped her public identity for good.

Why did Gretel Killeen leave Big Brother?

The short version: the original format ended, and when the show returned, it returned with a new host.

What did Gretel Killeen do after Big Brother?

• The original Big Brother run concluded after Season 7 in 2008.
• The franchise was revived in 2012 with a different host.
• After Big Brother, Killeen wrote numerous children’s books (news.com.au, Australian entertainment desk).
• She then moved across television, documentary and charity work.

The specific circumstances of that 2008 exit remain the least documented part of her story; the timeline is what’s clear — the original run finished, the 2012 revival chose someone else, and Killeen kept working.

The trade-off: losing the country’s biggest TV gig would end most careers. For Killeen, it cleared space for books, documentaries and the slow-building comeback that arrived in 2025.

What is Gretel Killeen doing now?

In 2025, the answer has two parts: she is hosting The Traitors Australia, and she has published a book called My Daughter’s Wedding.

Who is the host of The Traitors Australia?

• Killeen was named host of The Traitors Australia in 2025.
• Her 2025 book, My Daughter’s Wedding, was published alongside the announcement.

Her official biography adds more texture: she has appeared as The Octopus on The Masked Singer Australia, competed on The Amazing Race Australia: Celebrity Edition with her daughter, wrote and directed the 2022 documentary series The Best 30 Years, and served as a UNICEF Goodwill Ambassador — with touring shows for Australian troops in Afghanistan, Iraq, Egypt, the Solomon Islands and East Timor added along the way (Gretel Killeen’s official biography).

The announcement read as a homecoming: the original face of Australian reality TV returning to a format built on lies, loyalty and social strategy. Killeen has kept her own commentary light on social media, where she mostly shares fashion and book updates.

The dual announcement of a new show and a new book in 2025 confirms Killeen’s status as a working creative.

Who was Gretel Killeen’s ex-husband?

Killeen’s public life is well documented; her private life less so. The available record is compact: she has been married twice — first to Michael Killeen, and later to Gary Stern — and has one daughter, Tess Killeen Stern, from her second marriage.

How many times has Gretel Killeen been married?

• Twice: first to Michael Killeen, then to Gary Stern.
• Michael Killeen is the ex-husband the question usually refers to — and the surname she continued to use professionally.
• Gary Stern is her second husband and the father of her daughter.

Who is Gretel Killeen’s daughter?

• Name: Tess Killeen Stern.
• From Killeen’s second marriage.
• Now an adult — and the subject of Killeen’s 2025 book, My Daughter’s Wedding.

The pattern: Killeen has kept the people closest to her out of the spotlight while happily making them characters in her work.

Timeline signal

Six dates, one pattern: a decade on top, a decade of reinvention, and a 2025 return to prime time.

The pattern: time away from the spotlight didn’t shrink her profile — it gave her room to rebuild it.

What’s confirmed and what’s unclear

Confirmed facts

Gretel Killeen hosted the first seven seasons of Big Brother Australia. She was named host of The Traitors Australia for a 2025 season. She has one daughter, Tess Killeen Stern, and was married to Michael Killeen. She published My Daughter’s Wedding in 2025.

What’s unclear

Exact date of birth: widely listed as 3 February 1963, but not independently confirmed by top-tier sources. Specific circumstances around her 2008 Big Brother exit. Ethnicity: not stated in high-authority profiles. Whether she will return for further seasons of The Traitors Australia beyond the announced 2025 run.

What this means: the confirmed picture is solid on the big beats, but the gaps matter for anyone writing the definitive Killeen biography.

In her own words

Two statements frame the arc of Killeen’s career — one from the beginning, one from the official record.

“There’s no way they’re gonna want me.”

Gretel Killeen, recalling her first reaction to the Big Brother audition, as told to news.com.au

“Best-selling author, award-winning comedy writer and television host.”

Gretel Killeen’s official biography

What the 2025 comeback means

The double announcement of 2025 — The Traitors Australia and My Daughter’s Wedding — is the clearest signal yet of how Killeen wants to be remembered: not just as television’s original reality host, but as a writer and public figure who outlasted the format that made her famous. The Traitors is a show about trust and deception, and it puts Killeen back in the role she built her career on: watching, reading people and sending them home. For Australian viewers, the choice is simple — show up to see whether the original Big Brother host still has the pull, or wait for the next revival to prove that somebody else does.

Frequently asked questions

The FAQ reflects the most common inquiries about Killeen’s career and personal life.

Related reading

• Shaun Micallef: Age, Family, Law Career, Books & New Show
• Marc Fennell: Biography, Age, Shows, and Personal Life

Both profiles explore how other Australian TV figures built long, multi-format careers. Killeen’s own career demonstrates the same adaptability.