By Tom Place For Daily Mail Australia
Published: 02:00 GMT, 12 December 2019 | Updated: 04:28 GMT, 12 December 2019
Bec Hewitt shares three young children with her tennis star husband Lleyton.
And on Thursday, the 36-year-old former Home and Away actress took to Instagram to celebrate the 11th birthday of her son Cruz.
She shared two images of the budding tennis star that showed just how much he had grown over the years.
'When did you get so big?' Bec Hewitt took to Instagram to celebrate the 11th birthday of her son Cruz. Pictured left and right
The first picture saw a much younger Cruz holding two tennis rackets that were almost as big as him, while the second was a recent image showed the boy looking much older.
She began her caption: 'When did you get so big?'
Before carefully wording her next response as