Carrie Underwood and her husband Mike Fisher are both famous in their own right and have a legion of fans around the world - but when it comes to their personal life, they are relatively private.MORE: Carrie Underwood marks Fourth of July in bittersweet postHowever, the award-winning singer made a surprise revelation about their differences when it comes to socialising in a recent interview on Today's Country Radio With Kelleigh Bannen.The former American Idol star revealed that while she prefers to stay at home, Mike loves nothing more than socialising with friends.VIDEO: Carrie Underwood and Mike Fisher's love storyShe said: "He's got a million friends and we're always hanging out with them. So yeah, I feel like we balance each other out.