Living the life of a lotto winner

Enjoying all the benefits of wealth without doing any work, usually because of the generosity of parents.

She: Wow, that guy is lucky: he's unemployed and living with his parents in their mansion, his mother is a great cook, he has the use of his father's Mini Cooper, and spends most of his time swimming, playing golf, and, generally, anything that he wants to do.
He: Yeah, he's living the life of a lotto winner.