Tim Burton and Helena Bonham Carter
12/04/2007 AT 03:45 PM EST
The household of Tim Burton and Helena Bonham Carter is outfitted for Christmas – just not in the traditional manner.
"He decorates it with dead babies and slime balls and things," Carter, 41, tells Playboy
magazine in its January issue, about trimming the tree with boyfriend (of six years) Burton, 49. "It looks lovely and glittery from afar, and then as you get closer, you realize it's rather gory."
Lest anyone get the wrong idea, Carter, who stars with Johnny Depp
in Burton's new movie musical Sweeney Todd
, says, "We're not that dark. What I love about Tim is that he retains a certain innocence and a childlike quality. He sort of forgot to grow up. I think I've definitely forgotten to grow up, which is great."
Carter, who in 2003 gave birth to the couple's son Billy Ray – and is expecting their second child later this month – adds with a laugh, "At some point, [Billy] will probably want parents. He'll have to look elsewhere."
Of their life at home life, where she and Burton share separate, yet attached, houses, Carter says: "Mine looks like Beatrix Potter. ... He has dead Oompa-Loompas around and multicolored fiberglass alien lamps. But then he has some nice red-button sofas from Sleepy Hollow. So it's a funny and good mix."