Eve Hewson joined Sean Penn at the Palais des Festivals this lunchtime for the 2011 Cannes Film Festival “This Must Be The Place” Photocall.

The newbie wore a Miu Miu Spring 2011 dress.

Her mint green, black and white star print satin dress with a neon-green cut-out leather yoke is similar to the dress Emily Browning also wore during this festival.

It looks like she’s starting off on the right foot, because she opted for purple suede Miu Miu peep-toes to complete her look.

She looks great here, but the real test will come at the premiere later tonight.

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Credit: Style.com & Getty