Attending the event with her son, Curtis, 56, tried to stay incognito by dressing up as Vega from the Street Fighter series, reported E! online.
The Hollywood star was joined by the likes of Makoto from Street Fighter and Dr Bosconovitch from Tekken.
Curtis previously said she would be attending the event, before revealing that she chooses Cammy when she plays Street Fighter.
A celebration of the fighting game genre, this year's EVO Championship Series is currently taking place in Las Vegas.
Fighting game enthusiasts can win money by competing in tournaments for games such as Street Fighter 4, Tekken 7, Super Smash Bros Wii U, Mortal Kombat X and Persona 4 Arena Ultimax.
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