The former couple are currently separated on screen following Bianca's decision to reunite with ex-boyfriend Vittorio, but in an episode soon to air in Australia, they get a chance to talk through their differences on the night of the school formal.
Liam and Bianca's time in each other's company comes thanks to some scheming from April (Rhiannon Fish), who is determined that the pair should get back together.
Speaking to TV Week, Whitehead commented: "Liam's being quite sensitive about the issue. If Bianca's engaged to Vittorio, then she's clearly made her decision.
"There are still very strong feelings there, though - and at the formal, after being tricked into going as chaperones for the kids, they can actually sit and talk about things."
He continued: "They're like, 'Let's get out of here and talk about the past' - and it gets a bit hot and steamy!"
Whitehead added that the storyline builds up to "a really good week of episodes" as Bianca must choose who she wants to be with as her wedding draws ever closer.