Argento was left devastated by the death of Bourdain after he hung himself in a French Hotel this week.
She last posted an image of herself with Bourdain, 61, on May 27 with the pair having a fun time in Florence.
After he died she released a statement saying: 'He was my love, my rock, my protector. I am beyond devastated'.
The couple had been together for two years although there has been speculation that they may have had an argument recently.
Argento, 42, wore dark sunglasses and was surrounded by two female fans as she got into her car.
Bourdain's funeral is expected to take next week after the French authorities ruled that his death was suicide by hanging with a belt from a robe.
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