Autumn has arrived and SI's Swimsuit models are enjoying the great outdoors. Bruna Schmitz went four-wheeling during Day 4 of the Fiesta Movement while Christie Brinkley took off for Africa to raise publicity for the country's endangered species. Newleyweds Chrissy Teigen and John Legend, meanwhile, enjoyed some beach time during their honeymoon. Miss any of the action? Don't worry - we've got the best photos in this week's Instagram gallery.