Zaetta was born to an Italian father and an Australian mother, and is the granddaughter of acclaimed botanist James Howard Browne OAM. She spent the earlier years of her life living in Merbein, Victoria. There, her family interests were in a local brick manufacturing business.
Tania is the cousin of Julia Zaetta, editor of Better Homes and Gardens and many other magazines.
From 1992 through 1994, Zaetta co-starred alongside Ian Turpie in the Australian version of Supermarket Sweep.
From 1996 until 1998, Zaetta co-hosted the Seven Network adventure-show, Who Dares Wins, alongside Mike Whitney.
In 1999, Zaetta landed one of the six supporting roles opposite David Hasselhoff as Kendra the triathlete, in the short-lived Australian edition of Baywatch.
Between 2000 and 2001, she had a supporting role in the Australian television series Pizza.
Zaetta co-hosted Mission Implausible, Britain's Sky1 prime-time show, with Jason Plato, which found both hosts competing against each other in a series of challenges each week.
Zaetta also hosted a series of TV specials in New York on The Great Outdoor Games for American sports network ESPN, and in San Francisco to host TV specials for the 2000 Summer X Games.
On 1 August 2008, Zaetta was confirmed by the Geelong Advertiser to co-star in a planned feature film to be shot entirely in Geelong called The Ninja. The film was slated to start shooting in 2010, with a cast including Rob Baard, John Schneider, Roger Cross, John Wesley Shipp and Jeremy Kewley.
Zaetta was on The Blue Planet, Network Ten's lifestyle/travel show. She also competed season three of the Australian installment of Dancing with the Stars.
In April 2010, Zaetta commenced filming on the Sunshine Coast for a movie called Just Like U. In May 2011, Sydney-based author, Amanda Cole, issued Who Needs Prince Charming?, a self-realisation book for women, which collated contributions from 35 Australian women including Zaetta, Bianca Dye, Camilla Franks, Kathryn Eisman, Molly Contogeorge and Cindy Pan.
In 2012, Tania Zaetta was one of 12 celebrities who participated in Season 2 of The Celebrity Apprentice Australia. She was fired by Mr. Bouris after Task 5 of the series.
Her first step into the Bollywood limelight was in Bunty aur Babli in 2005, before winning a support role in Salaam Namaste which was shot in Melbourne, Australia later that same year.
Dil Apna Punjabi gave Zaetta the chance to work with Harbhajan Mann in 2006.
Zaetta’s fourth film Mr. White Mr. Black was released worldwide in 2008. The character saw her as a Charlie's Angels style action girl in pursuit of stolen diamonds while being chased by criminals. This required her to learn fight sequences and perform wire work to display flying somersaults and mid-air kickboxing manoeuvres.
Zaetta has released an online program aimed at building a better body through Pilates training.
Zaetta co-founded a charity, Peace for the Children, with Grant Hilton. The Office of Fair Trading launched an investigation in March 2011 after it was revealed 'Peace for the Children' was not a registered charity, and audit of the charity by 'IPS Audit' showed it had directed less than a quarter of its income towards charitable projects, with the majority of the donations being used to cover costs. On 7 June Tania was cleared of the allegations she collected donations through her unregistered charity, Peace for the Children.
Zaetta toured Australian Defence Force bases in Afghanistan and Iraq during early 2008 with a group of entertainers including 12 members of the Royal Australian Navy's band, Angry Anderson, The Wolverines, and others. After the tour, accusations arose in the media that Zaetta had engaged in sexual relations with one of the Australian Special Air Service Regiment (SAS). This was quickly denied by Zaetta and members of the touring group. The following day, an unreserved apology was given by the Department of Defence. In September 2009, the dispute was settled out of court with Zaetta for an undisclosed sum.
Tania Zaetta recently completed filming of Celebrity Apprentice alongside her former Baywatch star David Hasselhoff and is now basing herself in Melbourne. She was the third person "fired" from the show, but was able to raise over $70,000 for charity before her departure.