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A girl has the right to change her mind… especially on the red carpet.

January Jones wore a beautiful, if demure, lace gown by Carolina Herrera to the Screen Actors Guild Awards on Sunday.

"I fell in love with this dress," Jones told E!'s Giuliana Rancic on the red carpet. "I look at the rack and know what looks good and what doesn't."

The high neckline and short sleeves were a huge turnaround from the Mad Men star's daring, cut-out Versace dress from the Golden Globes two weeks ago.

The red-hot gown drew mixed reactions from critics. "With a dress like this…the line between classy and crass is a hard one to walk," said E!'s Fashion Police.