ONTD Fav Jessica Chastain joins Instagram

Actress Jessica Chastain posted a cryptic message to her Facebook feed today - she had joined Instagram, but only offered a hint as to what her username is.

Her fans cracked the riddle in seconds - you can follow Jessica at @Chastainiac. Her sole photo so far is at the Art Gallery of Ontario in Toronto, where she's filming Crimson Peak with director Guillermo del Toro.

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Who are your fav celebs you follow on Instagram?