It's the dear matriarch of the Weasley clan, Mrs. (aka Molly) Weasley, seen here offering you a plate of fresh, delicious cookies. I assume they're delicious, anyway. They look like chocolate chip, but you just never know in the wizarding world. They eat some strange things. But go ahead and try one. I want to see how you react before I try one.
Molly, along with husband Arthur is the parent of seven kids. They stopped with little Ginny either because they were satisfied that they'd produced a daughter at last or they were hoping to eventually have a non-ginger and finally just gave up.
(SPOILER ALERT FOR NON-READERS WAITING FOR THE LAST MOVIE)
Molly is also notable for uttering the only swear word (not to be confused with curse words, of which there are many) in the Harry Potter series, calling Bellatrix Lestrange a word that rhymes with the inoffensive-in-their-world "witch" just before killing her. Don't mess with Mrs. Weasley. Push her too far too often and she might get you an R rating.