Bastian joined the Channel 4 soap opera Hollyoaks in 2001. She was involved in a controversial storyline where her character was fired from her teaching job and sent to prison after having an affair with one of her students. In December 2005, alongside her Hollyoaks cast mates Jodi Albert and Sarah Jayne Dunn, she appeared in an exercise video, Hollyoaks Get Fit. At the 2006 British Soap Awards, Bastian and Chris Fountain won the award for Best Storyline. She departed the series in 2007.
2007–present: ''The Bill'' and ''Doctors''
Bastian has also appeared on television in Cavegirl, A Touch of Frost, Twenty Four 7, and Here After. Bastian joined the long-running ITV police dramaThe Bill as PC Sally Armstrong in summer 2007, and departed in late 2009. In late 2018, it was announced that Bastian had joined the cast of the BBC daytime soap operaDoctors as Becky Clarke. Her first episode as Becky aired on 5 February 2019. Bastian made an unannounced departure from Doctors in the episode broadcast on 6 November 2019, and confirmed after the episode aired that she had left the series.
''Strictly Come Dancing''
In 2009, Bastian was a contestant on Strictly Come Dancing, departing in the semi-final, where she was partnered with Brian Fortuna. In week 11, she severely bruised the bones of her foot while training, but the medical team gave her the all clear to go ahead and perform. Bastian and Fortuna finished in third place out of sixteen couples. The pair danced again in the Strictly Come DancingChristmas Special in 2009, and won, having scored 40/40 for their Viennese Waltz. Bastian then joined Fortuna in the West End dance showBurn the Floor, which opened at the Shaftesbury Theatre on 21 July 2010 and ran until 4 September 2010.
Stage work
Bastian has starred alongside Dawn Steele and Matthew Lewis in the UK touring version of Bill Kenwright's production of Verdict by Agatha Christie, playing alter-ego Helen Rollander.
Other work
Bastian was signed to Storm Models, and has worked for Littlewoods within a new range called Drama Queens.
Personal life
Bastian became engaged to musician Tom Clay in 2013. In February 2019, she married actor David O'Mahony. In October 2019, she announced she was pregnant with their first child, and as a result, departed from the cast of Doctors. On 17 March 2020, she announced the arrival of their daughter, Isla.
