Whether they love him or hate him, there are some very famous people in Spencer Pratt's world. Pratt, Us Weekly's latest cover star, opened up about some of the name-drops in his upcoming book, The Guy You Loved to Hate (out January 27), revealing some of his most A-list interactions didn't even make the final edit. "Growing up, my best friend - and I was so young I didn't even appreciate it - was Meryl Streep's daughter Mamie Gummer. I was on set multiple nights with her for Death Becomes Her, which now I look back, I'm like, 'What a dope movie!'" Pratt tells Us.