I haven't seen the movie, but I take it Haley Lu Richardson's exquisite in-betweenie doesn't make an appearance in it? :-\
I haven't seen the movie yet, but if all three girls each had their own bellybutton related scene, it would have already been mentioned here. Hell, in that case, it would have been deemed the most see movie event for navel fetishists since the first Bring It On.