The 'Dirrty' singer has offered her pop rival an olive leaf in the form of a $570 gift bag for the 'Toxic' star's new son, Sutton Pierce.
Christina asked a shop assistant to help her to pick out the presents which included a hooded towel, overalls, slip­pers and a crockery set, according to Life and Style magazine.
Meanwhile, Britney has reportedly spent $100,000 on redecorating her one-year-old son Sean Preston's bedroom ready for Sutton to move in.
An insider claimed: "Britney worked with two designers to make the nursery state of the art.
"She told the decorators to spare no expense. She's indulging herself and her new son. This is definitely the most joyous time of her life." The makeover includes the room being repainted blue with "nautical themes" and 'SPF' - the initials of both children - being stencilled on the wall.