"Angie is doing everything she can to get pregnant," a source told OK! magazine.
"She's taking prenatal vitamins, has dramatically cut down on her junk-food consumption, and is seeing her obstetrician regularly whenever she's back in LA," the source added.
According to the magazine, doctors had warned Jolie not to conceive for at least a year after she having twins, Knox and Vivienne, last year, reports the New York Daily News.
Although the babies' July 12 birthday is still months away, Jolie is anxious to add to the Brangelina clan.
"Her goal is to be pregnant by the time Knox and Viv have their first birthday," reveals the source.
"Angie is one of those people who always manages to achieve whatever she wants," the source added.
Along with the twins, Jolie and Pitt have another biological daughter, Shiloh, 2, and three adopted children, Maddox, 7, Pax, 5, and Zahara, 4.&13;&13;