Gwyneth Paltrow piled on the pounds while making COUNTRY STRONG - by dining out at co-star Tim Mcgraw's Tennessee home.
The actress, who plays MCGraw's alcoholic wife in the new film, couldn't get enough of the singer's speciality dish.
She explains, "He makes the best mashed potato you've ever had."
And MCGraw admits he was surprised by the actress' appetite: "You should have seen her eating every day. We had her over a few times, but, after twice, I couldn't afford it."