One half of the Twilight couple seems to have babies on the brain right now. In the newest Twilight movie, Kristen Stewart and Robert Pattinson are parents on-screen, to the 11-year-old Mackenzie Foy, who plays their mutual daughter Renesmee. On set the couple really connected with Mackenzie, and now it seems like they're bitten by the baby bug too: "They wold talk about how they would raise their own children", a set source reveals.The couple has been together for three years, and close sources admits that they're ready for the next step. During a wedding they attended together recently, the couple were more interested in what comes after marriage- babies! "Kristen was talking to a pregnant guest and told her that she would love to have a baby with Rob", a source says. "She thought it was so cool - at one point she touched the woman's belly to feel the baby kick". And Rob couldn't be happier either: "He's over-the-moon in love with Kristen. For him, she's The One". Aww, we think it's time to put a diamond on her finger, Rob!