which celebrity has the biggest but?
['13 Jennifer Lopez.', '14 Beyonce. ... ', '15 Coco Austin. ... ', '16 Khloe Kardashian. ... ', '17 Jen Selter. ... ', '18 Nicki Minaj. ... ', "19 Rihanna. Rihanna has a butt that's a strong competitor in a field such as this. ... ", "20 Iggy Azalea. Iggy has a butt that sort of falls under the same category as Kim Kardashian's. ... "]