Nick Cannon and Mariah Carey's twins are polar opposites.

The couple have 22-month-old children Moroccan and Monroe together and the 'America's Got Talent' host thinks their development is ''crazy''.

He said: ''My son is pretty laid back and my daughter likes to control the situation.

''They're walking, talking, singing. They know the alphabet. It's crazy. There's a new milestone every day.''

Nick also revealed the twins are a handful and he and Mariah have to tire them out during the day to get them to sleep.

He said: ''We're parents first and foremost so it's all about taking care of the kids and making sure they're asleep by eight. They're tough to put to bed so we've got to tire them out! But luckily they usually sleep through the night.''

Nick also revealed having kids has brought him and Mariah closer together.

He told In Touch magazine: ''You can definitely have a family of two people but when you create humans together, it changes things. It's brought us even closer together Being parents creates a whole different dynamic, you make different decisions. But it really solidifies what a family is all about.''