Pengilly signed to Wilhelmina Models after graduating from high school and became a youth ambassador for the 2006 David JonesSummer collection, along with Megan Gale. Pengilly has walked for leading designers at Australian Fashion Week, living and working in Tokyo, Osaka, London and New York, and fronting major campaigns. She has worked with top photographers Rankin, Steven Chee, Nick Scott, Nicole Bentley, Pierre Toussaint, James Demitri and Bradley Patrick, and Terry Richardson. She featured on magazine covers and in editorials for InStyle, Elle, The Times, Harper's Bazaar, Marie Claire, Oyster, Seventeen, and Glitter. Pengilly was also selected for many elite roles, including ambassador for leading Australian department store David Jones, face of the L'Oreal Melbourne Fashion Festival, face of the Nokia L’amour cell phone collection, ambassador for Sony, ambassador for Barbie and the "legs" of Japanese stocking label ATSUGI. In 2009, Pengilly was named Ambassador for the L'Oreal Melbourne Fashion Festival, working alongside J. Alexander and Doutzen Kroes. She also worked as a TV presenter for Fashion TV at London Fashion Week, before returning to Sydney for filming commitments. She signed on as an ambassador for the charity Alzheimer's Australia, adding to her previous involvements with charities including The Eye Foundation, SunSCHine/Sydney Children’s Hospital and the RSPCA. Pengilly began a fashion and lifestyle blog in 2011. She was nominated for PETA's annual Sexiest Vegetarian Celebrity Awards in 2014.
Acting
Pengilly began studying acting in her spare time, and attended classes at National Institute of Dramatic Art and Actor's Centre Australia. She was cast in the independent feature filmLBF in 2011. The film is based on the Australian novel Living Between Fucks by Cry Bloxsome and stars Australian actors Toby Schmidt, Gracie Otto, Septimus Caton and Bianca Chiminello. The film, directed by Alex Munt, premiered internationally at South by Southwest festival. She starred in the independent short film Object in 2013, which screened at the Cannes Film Festival. The following year, Pengilly competed in the 14th Season of Dancing with the Stars. She was partnered with Russian dancer Aric Yegudkin and danced for Fight Dementia. Pengilly and Yegudkin were eliminated in week three despite a score of 29 out of 40. Viewers thought Pengilly and Yegudkin's elimination was unfair, as fellow contestant Mark Holden had received a lower score. Holden later offered to swap places with Pengilly. Pengilly has worked as a television host, covering London Fashion Week for FashionTV. In 2015, Pengilly had a guest role in the Channel 7 miniseries . The following year, she had a guest role in Brock. She also appeared in the short filmsJinxed and Duffy. Pengilly joined the cast of soap opera Neighbours as Chloe Brennan in late 2017. She made her first appearance on 27 March 2018. Pengilly splits her time between her home in Sydney and Melbourne, where the studios are located.