Never heard of the guy, so I really don't have any point of reference, but I just saw this pic from Daily Thanks on him as Superman.
If it is...dayum. Give this guy his own special. Also find out what his mamma fed him.
https://www.yahoo.com/celebrity/daily-thanks-week-august-1-000000819.html
He does have a nice bubble butt but the suit and the angle of the picture makes it look extreme.
https://67.media.tumblr.com/8221a3323fb4e1845c4b1dd433b73d81/tumblr_inline_ob4akjRT2n1tlayim_540.jpg
http://darkshadowbeauty.tumblr.com/post/148355357427/just-for-those-of-you-who-think-that-his-ass-is
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I get the feeling that that pic was doctored to make his ass look bigger and rounder. As you can see in this other pic, it's round but NOT all that big.
http://67.media.tumblr.com/9511c9cfe3483020c5858f7b0d97ea89/tumblr_obalssQCgf1u7bgv6o2_1280.jpg
I don't think it was manipulated. There are actually two almost identical photos out there where the background is just a little bit different but the butt stay the same and it would be strange if someone manipulated both pictures. I think it's the angle of the photo (you can see both butt cheeks and yes I admit I have studied the pictures way to much) and the fact that he has heels on his boots which makes the butt look much bigger.
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I thought I'd revisit this thread since today is his birthday. I found this other pic of his butt in the superman suit, and it looks nice and perky.
http://67.media.tumblr.com/275a26b803da1a09ee1a708cd5071691/tumblr_ocnfrh97PT1vxkxivo1_1280.jpg
But yeah, I suppose that the angle of the original picture made his butt seem bigger than it actually is.