Peta was born in Auckland, New Zealand and raised in Perth, Western Australia. She studied classical ballet from the age of four and trained for 12 years under former principal dancer of the Kirov Ballet, Madame Lubov Nikonorenko.
In 2004, Peta was chosen to be a cast member of Burn the Floor, where she toured the world for six years. Burn the Floor then landed on Broadway in August 2009, where Peta was the lead female dancer.
Peta joined Dancing with the Stars in Season 13, where she was eliminated in the first round, but she returned with a vengeance as she and Donald Driver won the Mirrorball trophy in Season 14 and again with Nyle DiMarco in Season 22.
Peta is partnered with Nick Viall.