boxplot ggplot python not filling boxes with colours - python

So im using the diamonds dataset and want to do a box plot of price and cut of the diamond using ggplot in python. This is the line of code to do the plot.
ggplot(aes('cut','price',fill='cut'),diamonds) +geom_boxplot()
However, boxes stay gray even though the color legend shows. This is the plot I get:
How can I make the boxes fill the colour in the legend??
Thanks very much!

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Best regards,

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