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Despite that, the 40-year-old claims that the 'extra safety features' were what convinced her to buy her daughter the gift.
She told News.com.au: "It's of utmost importance to me that both she and her brother Hunter travel safely on the roads when going to and from school so I purchased a car for her.
"Obviously, she doesn't drive it, she is driven in it as is her brother to and from school and for any activities.
"Given the number of fatalities on our roads their safety is so important so if it means buying a car that has extra safety features that's what I'll do."
Well, that seems as if it comes from a good place.
The car itself is a Mercedes Benz GLC Class, and Roxy has been sharing some pictures of it on her Instagram page, where she has more than 260,000 followers.
Naturally - this is the internet after all - opinion has been divided over her slightly unorthodox choice.
After she shared a picture of the car being serviced, one person commented: "Seriously? A car for someone who can't drive for how many years."
Another wrote: "Please tell me this is a stitch up! It has to be!"
A third said: "How can a child have a car?"
Exactly like this, that's how.
Despite some expressing disbelief, many have said that it's actually a good thing.
One such supporter said: "Sorry but I absolutely ADORE the fact that Pixie has a car."
Regardless of the opinions of internet commentators, Roxy is pretty much at liberty to do whatever she so desires for her two kids.
She's got a six-year-old son called Hunter too, although it's not known whether he has his own motor just yet.
Roxy and her family are doing alright for themselves, too. She's the owner of several successful businesses such as Sweaty Betty PR, and her husband Oliver Curtis seems to do alright for himself as well.
Even Pixie has her own business called Pixie's Bows selling - you've guessed it - hair accessories.
The family live in a huge mansion in Sydney, and are therefore presumably unconcerned with the views of Instagram folks on whether they can buy a Mercedes for a nine-year-old or not.
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