The 38-year-old claims the two-week-long red carpet extravaganza allows celebrities to experiment with their style without having to worry about criticism, unlike a Hollywood bash, reported Contactmusic.
Longoria, who accidentally flashed much more than she bargained for in a mint green Versace gown during this year's festival, believes risks are allowed.
"You can't do that in Hollywood - they would criticise you for this neckline being too low or that colour being too bright. In Cannes, the more daring you are, the better it is, so it's a lot more fun.