I am m25 i dont knw why i am gaining weight/fat only in my thiegs and hips.wat should i do to reduce it?

i got marrid recently a 4months b4........the moment i got married i strted gaining weight in my hips and thiegs.?its really looking oddd ....wat should i do to reduce it?plz help me i was of 74 kgs now just witth in 4 mnths of my marriage i put up a lot of weight and now i am of 84 kgs.