Christina Applegate refusing to give up her goal of being a mom.

Days before she was diagnosed with breast cancer last month, Christina told an interviewer of her longing to get pregnant. "I'm at that age where, biologically, it calls me a lot," she said. "I don't want to wait until I'm in my mid-40s."

The actress is so determined to have a baby that she has vowed to put off a punishing course of chemotherapy until after she has succeeded in starting a family, Star reports. The Samantha Who? star's plan is to conceive a baby with musician Martyn Lenoble, whom she has dated for several months, says a friend. As soon as possible after the birth, she will start treatment.

"A baby is the most important thing in the world to Christina right now," says the source. "She doesn't want to expose her body to chemo or radiation until after she gives birth."

Image WENN