11/30/2012 AT 6:20 PM ET
“We talk during rehearsals and commercial breaks, and he’s like, ‘What time did you cut the cake?’ ” Kardashian tells PEOPLE of her The X Factor cohost. “I’m like, ‘I don’t know. I was so wasted at my wedding.’ ”
But there is one bit of sincere advice she has imparted to Lopez: leave the “hosting” to his on-camera duties.