Christina Aguilera's son is the "love of her life".

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 mum 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 mummy 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."