Big Brother’s Katie Williams grabs lunch with co-star Brenton Balicki in Bondi

Big Brother Australia star Katie Williams kept things cool and casual as she stepped out in Sydney on Saturday.

The 27-year-old wore a P.E Nation T-shirt and black shorts as she enjoyed lunch with her co-star Brenton Balicki in Bondi.

The champion sprinter teamed the outfit with a pair of black sneakers and tossed a jumper over her shoulders.

Katie also wore round sunglasses to protect herself from the bright sun and wore a gold necklace and silver watch.

Meanwhile, Brenton dressed casually for the outing in dark jeans and a black T-shirt. 

He completed the ensemble with a pair of sneakers and wore a black cap.

After enjoying a walk along the footpath and chatting, the pair were spotted sitting in a café.

Katie and Brenton are currently contestants on this season of Big Brother.

This year, Big Brother Australia has been whipped in the ratings by Channel Nine’s Lego Masters.

The Channel Seven show hasn’t captured audiences as hoped – and insiders are blaming the cast, an alleged source told The Daily Telegraph on Saturday.

A lack of ‘eye candy’ and ‘young, hot singles’ in favour of an ‘all ages’ line-up is the culprit, an insider claims. 

‘When something underperforms like this, obviously fingers get pointed and there is a lot of chatter that the casting just wasn’t right,’ the alleged source told the paper.

They went on to say that Big Brother would have done better if it had featured the sort of cast that has been a hit for Nine’s Married At First Sight.

‘I think there is some thought that that show could have benefited more from a cast that reflects something like Married At First Sight,’ they added.

According to The Daily Telegraph, Big Brother Australia is averaging just 500,000 an episode.