Justin Bieber got a bad reception yesterday when he took his mom to an L.A. Clippers game. "The entire placed booed him when Staples Center cameras put him on the jumbotron," a source tells E! News. Bieber and his mom Pattie Mallette were there to watch the Clippers take on the Oklahoma City Thunder in game four of the NBA playoffs. Despite getting booed, the 20-year-old pop star seemed to have a good time. He took several cute selfies with Mallette and even tweeted a photo of her holding a hotdog along with the caption, "Took my mom to the game... She's more focused on the food."