Happy birthday, Pippa Middleton! After one heckuva year, the middle Middleton sibling turns 28 today. How does she celebrate? By heading to work in an H&M dress! Pick up the same one, also available in black, at H&M for $34.95 (find your local store at hm.com). Celebrate the birthday girl's style by paging through all of the party planner's recent outfits in the gallery.