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The 25-year-old wore a cocktail dress from the designer's Fall 2010 collection that had a cascading bold ruffle detail from shoulder to hem and jeweled accents alongside the ruffle.
Michelle accessorized with pointy metallic silver heels, a nude croc leather clutch, chunky tear drop earrings, Studded bracelet and cocktail ring.
Her hair was styled in a sleek pulled back ponytail. Smoky eye makeup, nude lip gloss and nail polish matching her dress rounded her wow worthy look.
Confirming her return as Georgina Sparks to Gossip Girl series, Michelle told Access Hollywood, "Yes, I will be back."
"Georgina is trouble. That word has become synonymous. There will definitely more 'Gossip Girl' in my future."
Georgina character is that of a cruel, manipulative young socialite who creates havoc throughout the show.