In a piece for the Mail on Sunday, Dame Jacqueline admits she was a late comer to reality TV, but now thinks that they are educational and demonstrate to kids that perseverance and hard work can get you to the top.
She added that prime-time reality programmes show children that anyone can succeed, regardless of their background.
The writer also praised how shows like X Factor and Strictly bring families together.
"One of the things I like about them is that they give everyone the chance of making it," she wrote. "What's more, I'd argue that in a way they're educational, for they show that perseverance, hard work and listening to advice can help you make it to the top."
Jacqueline, 67, also said that reality telly kept older entertainers like Sir Bruce Forsyth, 85, and Len Goodman, 69 in work.
She said talent shows were 'among the few prime-time entertainment programmes in which older people are given equal billing to the young and glamorous'.