Idina Menzel has to "watch what she says" at her son's basketball games

She said: "I'm very competitive.

"I have to watch what I say at my son's basketball games."

Idina - who is now married to Aaron Lohr - has her own fashion line, which was inspired by seeing stylish other moms when she was doing the school run.

She told Us Weekly magazine: "I was inspired to design my clothing like,

Encore by Idina Menzel, when I realised how well put together all of the other moms were at school drop-off in the morning."

Although Walker is almost a teenager, the 51-year-old actress still can't resist cradling him like a baby.

She said: "My son is 12 but I still like to hold him like a baby when he sleeps."

And Idina got to live out her own childhood fantasies when it came to creating playhouses for her son.

She said: "I built my son the treehouse I always wished I had as a kid."

The 'Cinderella' actress previously credited her son for helping her adjust to turning 50.

She said of reaching the milestone age: "I am ashamed to say it, but I was having a hard time with it. I think it was subconsciously bothering me more than I led on, in regards to my relevance as a performer and actress. I'm feeling like the old lady sometimes, and that's not who I am. I feel very young at heart.

"I'm very vibrant, and the music I sing is for lots of young people. So it's silly for me to play into that. But I will be honest and say I have to combat a lot of my own neuroses.

"[Walker] says, 'Mom, don't look in the mirror and worry about how you look. You're beautiful.'"