The pair were spotted passionately embracing on a seaside dock in their hometown of Melbourne last month, with the former Bachelor winner sporting a glittering new pear-shaped ring.
Things have moved very quickly for the high-profile couple since they met in August playing for the same AFL Women's team, the Frankston Bombers.
Just two days prior to their engagement, mum-of-one Alex spoke openly about moving in together and the day Meagan met her six-year-old son, Elijah.
'I feel relieved that I can finally talk about it now,' she told the Herald Sun. 'As of the last few weeks we've lived together. It's been really nice. It just feels so good. Nothing forced or scary.
Although initially hesitant to start a relationship so soon after her split from Bachelor boyfriend Richie Strahan, she eventually 'muscled up the courage' to go for it.
The couple have been dating for three months.