Rachel Weisz Says Motherhood Is Indescribable

British beauty Rachel Weisz thinks that it's impossible to really describe what it's like to be a mom.

"People tell you about motherhood and you think, yeah, yeah, whatever," the Oscar-winner says. "But it’s something you have to experience for yourself to know what it is. It’s impossible to talk about it in any sensible way without sounding ridiculous. It’s a tremendous experience."

The 39-year-old star of The Lovely Bones hopes that her 3 1/2-year-old son Henry Chance doesn't follow in her footsteps ("I hope he’s not an actor – I’d dissuade him as hard as I could,"she says) but it sounds as though it may be in the genes!

"His dad brought him in after a matinee [of her recent play A Streetcar Named Desire] to watch the curtain call and he figured out bowing and getting claps," she says. "So, yesterday, he put on his policeman’s outfit and bowed. That was the show."

Though she calls her family her "greatest joys," Rachel says she and her beau Darren Aronofsky aren't in any rush to have another child.

"I don’t know. Not right now," she says when asked about another baby. "I’m very busy and there’s so much I want to do. I feel I’m just getting going."