Ashlee Simpson took her son Bronx to the annual Milk + Bookies event on Sunday in LA. The fundraiser hosts a large library of books for celebrities to sign and donate to children in need. The mother and son also enjoyed some playtime during their charitable morning as they met Yo Gabba Gabba! characters and listened to stories. Ashlee has been hanging out close to home with her little one and family in the wake of her split from Bronx's dad, Pete Wentz. The exes are making the best of their pending divorce and were spotted out together before he headed on tour with his new band Black Cards last week.