Charlize Theron's son recognises her on billboards

Los Angeles - Charlize Theron's son recognises her on billboards.

The blonde beauty is set to hit the big screen in A Million Ways to Die in the West and she was delighted to find two-year-old Jackson, who she adopted in March 2012, is able to identify her on promotional posters.

Talking on US chat show The Ellen DeGeneres Show, she said: "I dunno if he understands what I do but he definitely knows when he sees the billboards for the posters, for the movie, he knows that's me. He was on the movie when we were shooting so he saw me in the cowboy hat.

"I was driving him to kindergarten and we were stopping and he was like 'mumma', 'mumma', 'mumma', pointing at the posters."

Charlize - who is dating Sean Penn - stars alongside Amanda Seyfried, Seth MacFarlane and Liam Neeson in the western comedy and she found Jackson had a soft spot for the 'Mean Girls' actress.

She added: "There was one of the four of us, and he said 'Mumma, wears cowboy hat'. As I looked back there was a big grin on his face and he laughs.

"He thought Amanda was a princess and his mum just wore a cowboy hat."

Her co-star Seth added: "My cat gets really excited when he sees the billboards."