15. When Cara Delevingne took down the tone a little in this selfie from her BFF Rita Ora! This image appears in the gallery:15 Best Photobombs Of The Year 15. 15. When Cara Delevingne took down the tone a little in this selfie from her BFF Rita Ora! Picture: Instagram 15 images See the full gallery: 15 Best Photobombs Of The Year