The 30-year-old singer - who has three-year-old Max with ex-husband Jordan Bratman - admits her own happiness depends on that of her little boy, and she loves nothing more than relaxing at home with him.

She said: "The best thing about being a mom is seeing my son Max smile every day. He is truly the love of my life and knowing that he`s happy makes me happy.

"A great deal of my happiness revolves around my son. The best days are when I just get to lay in bed with him, get cosy in the blankets and watch a classic Disney movie like `Alice in Wonderland`."

Christina admits she is very different at home to her glamorous public persona but feels it is important to express both sides of herself.

She told Britain`s Hello! magazine: "When I`m at home being a mom I`m in my sweatpants. There are two different sides of me, the side of me that will sing my son to sleep at night and be a mommy in bed, cuddling with him and then there`s the side of me that gets out on stage and is quite the extrovert and the artist.

"It`s always important for me to express that side of myself as well."
sections: Celebrities