NY Fashion Week's It Girl

Barton wore an innocent white eyelet top with a fitted skirt to the Zac Posen show.

For the Anna Sui show, the former O.C. cast member wore a girlish Anna Sui pinafore with a Peter Pan collar.

Barton headed to a party in a bright frock from Luella.

The actress donned Matthew Williamson for a party at Saks Fifth Avenue.

The fashion lover wore a Marchesa dress to the label's show.

Barton wore a glittering seventies-style maxi outfit to the Calvin Klein after-party.

Barton wore a fanciful chiffon Matthew Williamson minidress to the designer's show.

The actress painted the town red in a leg-baring black-and-white minidress.

Barton's short lace dress brightened up the front row of the Jenni Kayne show.

The Keds spokeswoman wore a wild pair of the brand's flats to the Nanette Lepore show with a dress by (who else?) Nannette Lepore.