He has 6845 followers on the instagram (I just followed him!) He poses like the professional model. In each photo he strikes a confident pose, hand in pocket, gazing off into the distance. The photographs are straight off the fashion pages of Esquire - micro fashion shoots set up on location with palm trees, swimming pool and obligatory dog - dotted with a fair few selfies taken with his iPhone in front of the mirror.
Looking at his mother, an equally stylish figure with a penchant for Givenchy and Chanel, it is easy to see where he gets his fashion sense.
Ms Espinosa works for magazines like Harpers Bazaar and Alonso's father's income as owner and CEO of a private equity firm allow the family, originally from Monterrey, Mexico but living in Laguna Beach, sufficient funds to support their shared hobby.
In her line of work she is able to track down the latest looks for Alonso. According to The Cut, she snapped up his favourite All Saints boots in multiple sizes before they discontinued their children's line. She and Alonso also love Gucci and Dior, Stella McCartney, Little Marc Jacobs and Dolce & Gabbana.
Alonso's styling is his own doing, though Ms Espinosa says she will sometimes steer him in the right direction if something he chooses doesn't quite work, or is inappropriate for the weather.
And when they step outside, his fans often take his picture, although Ms Espinosa says her son will sometimes decline if he is too tired.
The pair's shared a love of fashion has allowed Ms Espinosa to bond with her son, and she says she relishes the opportunity to shop together.
Speaking in an interview with Joy Loves Fashion she said her son's favourite things to wear are 'combat boots and sunglasses' and that his recent obsession with bowties saw him going shopping to snap up all the prints that caught his eye.
Some internet users have criticised the Espinosa family for encouraging their son, who has an iPod and an iPad which he uses to produce his own shoots, to be materialistic. They say that for a young boy, he cares too much about his image.
What do you think about? He is adorable but he's 5. Isn't too young to start "modeling"?
I'm dying to hear what do you think