Newly weds Ian Somerhalder and Nikki Reed are through with their honeymoon phase and are ready to start a family – well, at least Ian is.

Sources have told Life & Style Weekly that the 36-year-old really wants to start having kids, but his wife just isn't ready – which has been causing some serious fights lately.

RELATED: AWK-WARD: Ian Somerhalder's Twitter Gets Hacked By a Fan of His Ex-Girlfriend!

"[He] has really been pushing Nikki to start a family," an insider says. "She feels she's just not ready yet, and that's put a tremendous strain on their marriage."

"She wants to focus on her work for animal rights causes," they said. "Ian supports her, but he thinks it's the right time for a baby."

The 27-year-old's career has really started picking up this year and she's been insanely busy. Right now, she's currently filming the movie The Highway Is for Gamblers, and has three more feature length films coming out later this years and next.

Luckily for Ian, Nikki isn't saying no to kids, she just doesn't want them right now.

For more on Nicki Reed and Ian Somerhalder, pick up the new issue of Life&Style — on newsstands now!