Heidi Montag and Spencer Pratt went on a casual date to Malibu Yogurt last night in LA. Spencer's 26th birthday is on Friday, which coincidentally is the same day Heidi's Playboy cover hits newsstands. The press-loving couple has been pimping the magazine everywhere, but apparently Heidi is trying to avoid telling her father about the sexy photo shoot. She revealed that her mother, on the other hand, gave her the go ahead: "My mom was so excited she was just, like, pose! God gave you that body, you show off that cute little thing." Whether or not Heidi's assests are entirely "God-given," she's doing a good job making sure everyone knows just when and where we'll get another peek at her Playboy debut.