Taking to Twitter, the 34-year-old actress shared a picture of herself along with the famous couturier and thanked him for designing the outfit.
"Thank u for a lovely evening @MichaelKors you're an absolute gentleman. @CFDA," she captioned the picture.
Earlier on Tuesday she tweeted, "Dear NYC, are you ready for this tonight with @MichaelKors for #cfdaawards."
She also posted several pictures on Instagram that showed the "Quantico" star posing alongside actor Armie Hammer and his wife Elizabeth Chambers.