Welsh centre Jamie Roberts - facing Australia for the first time this summer due to injury - has scored the Lions' fourth try, taking a pass from replacement Conor Murray before galloping home.
Halfpenny makes it another seven points, and the Lions start to celebrate a series win.
More top news
UK Shoppers could spend around £10bn this Black Friday period. Figures show the Welsh spend more on Christmas than any other part of the UK.
RSPCA Cymru are warning that almost 6,000 incidents were reported over festive period last year.
A fine and dry end to the week with plenty of sunshine, but it's a chilly day ahead!