Hiring a wet nurse - the legalities?

[Phteven]

This is totally theoretical because my womb is retired and my breast are all play and no work these days but......
Would it be legal for me to hire a wet-nurse?
Could I just pop an ad in Seek or my local classifieds seeking a lactating woman for a full-time live-in position position breast-feeding a baby and/or toddler?

What award would I need to pay her under?
Holidays or since it's a temporary role would I not need to worry about holiday pay?

I know that lots of people have informal wet-nursing arrangements but I'm curious about what would happen if I wanted a formal employer/employee relationship with a stranger.