Jennifer Aniston is not only trying to conceive twins but has also proposed to boyfriend John Mayer sources for Star magazine claim. "Now that Jennifer has proposed to John and he's excited about being a dad, she's doing everything she can to conceive before her 40th birthday in February," the insider says. "She's even been having alternative medicine treatments to increase her chances of having twins. She knows her baby-making years are limited. She's taking a lot of folic acid and has upped her intake of milk and beef all of which are supposed to increase your chances of having twins." Hmmm.


























