Thanks to Heather7, it was found that Richard Marc Toutounji recently added Renae Wauhop as a friend on Facebook.
Renae was the runner up in Miss Universe Australia 2010. She is (or was) a truck driver and roofer, quoted on News.com.au back in November 2009:
"I've always been a tomboy, I love camping and fishing but I'm bored of seeing all these models being in it - what do they do? They haven't been there and they haven't done that," Geraldton-raised, Perth-based former roofer and truck driver Renae Wauhop said".
From what I saw in the Channel 7 pilot promo, Renae did sound very tomboy like! I would say she 95% confirmed as the taller member of the blonde team.