Gisella Colletti, the talented 17-year-old (born April 2, 2008) powerhouse vocalist from Perth, Western Australia, became one of the breakout stars of Australian Idol Contestants (2025).

A student at Corpus Christi College with a background in theatre and over a decade of singing lessons, Gisella’s mature, soulful voice and commanding stage presence made her a fan favourite — despite being one of the youngest contestants.

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She ultimately finished in 3rd place in the grand finale on April 7, 2025, after reaching the Top 3 alongside runner-up Iilysh Retallick and winner Marshall Hamburger from Queensland.

Her journey captured national attention, especially in WA, where she aimed to become the state’s first Australian Idol (and the first female winner since the 2023 reboot). Fans were vocal in their support, with many expressing disappointment at her placement, claiming she was “robbed” due to her exceptional vocal talent.

Background and Early Life

Gisella hails from Perth and has been performing since childhood — from backyard birthdays to school choirs and local events. She previously appeared on Channel 7’s Telethon in 2024, singing “Survivor” by Destiny’s Child.

Idol scouts approached her years earlier, but she waited until she felt ready. Her entry began uniquely: judge Marcia Hines knocked on her door and invited her to perform at a Perth concert, which doubled as her audition — earning her a Golden Ticket on the spot.

Audition and Journey on Australian Idol

Gisella auditioned with “I Am Changing” by Jennifer Hudson (at Marcia Hines’ Perth show), showcasing her impressive range and earning immediate praise from the judges (Marcia Hines, Amy Shark, and Kyle Sandilands).

Key milestones and performances:

  • Advanced through early rounds with powerful ballads and high notes.
  • Top performances included “Defying Gravity” (from Wicked) in Top 12, earning massive acclaim.
  • Other standouts: “Firework” by Katy Perry (which caught Katy Perry’s personal approval via message), “Hero” by Mariah Carey (to secure her Top 3 spot), “All By Myself” by Celine Dion, “How Will I Know” by Whitney Houston, “Without You” (Mariah Carey), and more.
  • In the Grand Finale (April 6-7, 2025): Delivered a stunning duet of “Heaven Help My Heart” with Australian icon Tina Arena (a major highlight — Tina called it a “pinch me moment” and later invited Gisella to join her national tour), plus a solo rendition of “Flashdance… What a Feeling” by Irene Cara in a regal purple gown.

Notable events: Received standing ovations from all judges multiple times (e.g., after “Rise Up” by Andra Day in Top 8). No controversies — her run was positive, focused, and inspiring, with strong family/school support.

Elimination and Reflections

Gisella was eliminated first in the Top 3 results show on April 7, 2025, after public votes narrowed it to the final two (Marshall and Iilysh). Emotions ran high, but she expressed pride in her achievements and gratitude for the experience. Fans flooded social media with support, praising her unique voice.

Post-Idol Career

Since the finale, Gisella has embraced her momentum:

  • Released Idol performance tracks on platforms like Spotify and Apple Music (e.g., “Flashdance… What a Feeling”, “Defying Gravity”, “Firework”).
  • Debuted original single “Good Enough” in late 2025, available on streaming platforms.
  • Joined Tina Arena on tour (including Perth shows), providing real-world stage experience.
  • Active on social media (@gisellacolletti_music on YouTube, Facebook, etc.) with booking inquiries via gisellacolletti.music@outlook.com.
  • Continues pursuing a pop/R&B career, focusing on original music and live performances.

What Makes Gisella Standout?

  • Powerful, unique vocals — one of the most praised by judges and pros (Kyle Sandilands called her “absolutely incredible” and among the best he’s worked with).
  • Commanding stage presence and emotional delivery on big ballads.
  • Youthful maturity, fearless song choices, and relatability as a theatre kid from Perth.
  • Collaboration highlight: Duet with Tina Arena — a dream come true and major career boost.

What song did Gisella Colletti audition with?

“I Am Changing” by Jennifer Hudson — a powerful, raw performance that secured her Golden Ticket.

Has Gisella Colletti performed with any famous artists?

Yes — she shared the stage with Tina Arena for a standout duet of “Heaven Help My Heart” in the Grand Finale, leading to tour invitations.

What makes Gisella Colletti stand out in Australian Idol 2025?

Her exceptional vocal range, emotional intensity, mature delivery despite being 16/17, and ability to own massive songs with confidence and heart.

Has Gisella faced any controversies on the show?

No — her journey was controversy-free, positive, and focused on talent, earning widespread admiration.

Why Gisella Colletti didn’t win Australian Idol 2025?

She was a top contender and reached the Grand Finale Top 3, but ultimately finished 3rd (with many fans believing she deserved the crown). Marshall Hamburger won, Iilysh Retallick was runner-up.

Catch her full performances on 7plus. Gisella Colletti’s Idol run proved she’s a star in the making — with original music, tours, and a bright future ahead. WA’s powerhouse is just getting started! 🎤✨