Well, she won't be the mother. That much we know.
But Arianna Huffington - the professional blogger who created TheHuffingtonPost.com - will guest star on the May 10 episode of How I Met Your Mother.
Playing herself, Huffington will show up at a New York Party attended by Ted, Barney and Marshall. She follows in the hotter recent footsteps of Carrie Underwood and Jennifer Lopez.