Amanda Seyfried is Marc Jacobs Marvelous

Amanda Seyfried looks all sorts of classy at the Jennifer’s Body Hot Topic Fan Event at Hollywood and Highland on Wednesday (September 16) in Los Angeles.

The 23-year-old actress donned a chic Marc Jacobs Resort look and accessorized with Martin Katz jewels and a Judith Leiber clutch.

Amanda, who is dating her Mamma Mia! costar Dominic Cooper, recently admitted that she has roller-coaster emotions. “I suffer from anxiety attacks a lot,” she explained to Allure. “Like, the other day, I had an attack in the middle of a relaxing massage: My head was just spinning, and I felt nauseous! I was saying to myself, Just don’t make a scene! Finish this massage, or you’re going to be really annoyed with yourself.”

Jennifer’s Body also stars Megan Fox and Adam Brody — it opens TOMORROW!

15+ pictures inside of Marc Jacobs Marvelous Amanda Seyfried…