Sandra Bullock hasn't "stopped buying" Christmas presents for her son.

The actress is mother to Louis, who she adopted last year.

Louis will turn two at the beginning of 2012 and Sandra can't hold back from buying him lots of exciting gifts.

"I don't know if I've stopped buying!" she said this morning on TV show Today.

The host pressed Sandra to give more details about her present plans.

But the star insisted that if she revealed anything it wouldn't be a surprise for Louis.

"I'm not going to tell you. He understands everything," she explained.

She was also asked about her favourite Christmas song, but couldn't pinpoint just one.

Although she did admit she loved carols sung by big choirs.

"I know you want me to pick one thing," Sandra laughed. "But life isn't about just one thing."

Sandra is promoting her new movie Extremely Loud and Incredibly Close.

The film follows the story of a young boy whose father died in the New York City terrorist attacks on September 11 2001.

The Oscar winning actress confessed she couldn't turn down the role.

"You can't say no to that," she explained.