January, who starred in Mad Men from 2007 to 2015, a role for which she was nominated for two Golden Globe Award for Best Actress – Television Series Drama and a Primetime Emmy Award for Outstanding Lead Actress in a Drama, showed off her daring new cut on her Instagram account where it drew plenty of praise from her followers including some very well-known ones.
Actress Elle Fanning was delighted with January's chop.
"Oh my god .... you did it," she wrote, adding a full six exclamation marks.
"That is the dream cut."
Supermodel Linda Evangelista kept it simple posting seven black heart emojis. Alison Brie went for one word - and it was this - LOVE. Jaime King said the same - only three times.
And there were thousands more comments all of the same ilk. Seems January is onto a winner with this one.
The cut was carried out by celebrity stylist Bridget Brager who was also responsible for Bryce Dallas Howard's recently-chopped (and incredibly cool) blunt fringe and Sarah Paulson's slick Met Gala look.