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Amanda Seyfried, Marie Claire UK

Marie Claire UK/Matt Jones

In about five months, Amanda Seyfried will turn 30 years old, and the actress admits she's weary of getting older. 

"I keep feeling like my eggs are dying off," the Les Mis star admits in the latest issue of Marie Claire U.K. "I need to get on it… I want a child. Badly. I want to be a mother, badly. That's what I feel. I've been feeling it for like, two years. I'm not ready but nobody's ready. It changes everything… so how you can ever be ready for that?" 

Seyfried, who has been dating actor Justin Long since summer 2013, covers the August issue of the publication, looking absolutely stunning in a bright red shirt and matching lips. She also sports colorful ensembles inside the issue in addition to a sleek black pantsuit in one sultry pic. 

VIDEO: Amanda Seyfried wants to have a baby in ''four or five years''

Amanda Seyfried, Marie Claire UK

Marie Claire UK/Matt Jones

Seyfried's most recent film Ted 2, in which she plays a marijuana-loving lawyer, hit theaters last week. The actress replaced Mila Kunis as the female led the sequel and apparently, was worried she couldn't live up to the Black Swan beauty. 

"I'm convinced people are just going to go, 'Where's Mila?' And listen she's got a lot of fans," she admitted. "One of my favorite things about my relationship with Seth [MacFarlane, director] is that I make him laugh. Maybe he's just laughing to make me feel good but I genuinely seem to make him laugh and that brings me a good amount of joy."

While Seyfried first skyrocketed to fame thanks to her role as ditzy Karen Smith in Mean Girls, the actress, although grateful for the opportunity, said she was calculated when choosing her subsequent roles.  

READ: Check out the reviews for Seyfried's latest flick!

Amanda Seyfried, Marie Claire UK

Marie Claire UK/Matt Jones

"After Mean Girls I kept getting scripts for big-boobed blonde idiots. I could have so easily been Karen Smith my whole career," she revealed. "I realized that if I really wanted to work forever I was going to have to make the right decisions.… That's why I've made some tough decisions too, I've turned down some pretty big stuff. I didn't want to be an action hero or in a f--king green suit for like, ten years, because I don't want to be miserable. I think happiness comes from being free." 

These days, Seyfried has a hot boyfriend and a killer career, but that doesn't mean she hasn't had her fair share of ups and downs. In fact, she revealed in the issue that she has regularly gone to therapy and hopes to de-stigmatize mental illness. 

Amanda Seyfried, Marie Claire UK

Marie Claire UK/Matt Jones

"It's coping with life. I've been told to not talk about it, but [anxiety] is so very common," she said. "I just think, you go to your doctor about heart problems, or an eye doctor if you have an infection, you have to take care of yourself. Mental health is so segregated, it sucks. You don't necessarily have to have something chemically wrong with your brain to have mental health issues."

To read the feature in full, see the August issue of Marie Claire U.K., out today

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