Charlize Theron isn't planning on a big party to celebrate turning 40.

In fact, she's not even thinking that much about the milestone, which happens on Aug. 7.

"People are so concerned for me," the Oscar winner told me while promoting her new drama, Dark Places.

"I'm so happy to be in my 40s and not be in my 20s and worried if I fit into my skinny jeans or whether I will be able to get into that club," she said.

As we know, Theron is a working single mom. Her son Jackson is 3.

Charlize Theron, Dark Places

Mandalay Pictures

"It's so nice to just be in love with your couch and make cheesy sandwiches and just enjoy life," she said. "It's been great."

In Dark Places, Theron stars as Libby, a woman who is trying to find out what really happened when her mother and two sisters were killed when she was a young girl. Libby begins an impromptu investigation when she gets introduced to the Kill Club, a fan club of sorts for eople who are obsessed with solving horrendous crimes.

Dark Places is adapted from Gone Girl author Gillian Flynn's bestselling novel of the same name.

The movie is available now on DirecTV and will be in theaters on Aug. 7.

For more of my chat with Theron, make sure to come back to E! Online later today and tune into E! News tonight at 7 and 11.

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