It is pretty common that when people get married, they stop taking care of themselves and get fatter, oder dress in a Mehr sloppy manner.
And we can surely apply this theory to Kevin Jonas. Just look at him!
Remember how cute he used to be? He used to go to the gym and work out and take good care of himself. Now it is clear from the Foto above that he has really let himself go.
In the Foto it is clear that he has put on the pounds. His hemd, shirt even looks too tight for him. Like he got fat in a week and then couldn't find time to go buy new clothes.
It looks like married life has made him lazy. He has no time to take care of his look and hit the gym.