The 32-year-old singer and her ex brought Max, 5, to a birthday party on the beach that afternoon.
Last week, Christina‘s boyfriend Matthew Rutler was seen taking Max to a costume store in Los Angeles to buy a pirate costume.
FYI: Christina is wearing a Chan Luu necklace.
35+ pictures inside of Christina Aguilera at the beach with her son and ex-husband… More Here! »