The 'Dirrty' singer, who is believed to be around six months pregnant, invited close friends and family to the celebrations at her Beverly Hills home.
Christina, who set up a gift list at exclusive Hollywood baby boutique Bel Bambini, received a blue Loved Mom Guitar shirt, a Cariboo bassinet with blue bedding and Trumpette Johnny's socks.
One guest bought the pregnant singer a Sozo Whiz Kid Wee Block, which is used to protect parents from getting wet while they are changing a baby boy's nappies.
A source told People magazine: "There was a distinct blue-theme to the shower. I think it's safe to assume she's having a little boy."
It was recently reported Christina, who is married to music executive Jordan Bratman, has already named her unborn son.
A source said: "She rubs her baby bump and talks to the baby, calling it Jordy."