Recently Facebook has been adding new features to Instagram every few days or so, and this trend isn't stopping. The latest things to be built into Instagram are stickers. It's actually quite shocking that it took Facebook this long to put stickers into Instagram, considering its ongoing quest to make its photo-centric social network the perfect Snapchat alternative. But anyway, they're here now. You can use stickers in your Instagram Stories, adding context to your photos and videos. After you've finished your capture, a new Stickers button will show up next to the text and drawing...
Source: http://www.gsmarena.com/instagram_adds_stickers_one_tap_video_recording_to_stories-news-22270.php