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Today we spotted Pete Wentz and his adorable son Bronx Mowgli out in Los Angeles, and after hitting up Starbucks, father and son played in the park for several hours. Pete seems like he's really enjoying daddy duty, but we wanna know where mom Ashlee Simpson is! The last time we spotted Ash with Bronx was on February 14, when she joined Pete at The Beverly Hills Hotel's Polo Lounge for lunch...