Which TomTom GPS models allow you to add/download celebrity voices?

I’ve heard that you can add/download celebrity voices into TomTom GPSes, but I can’t find any information about which models have this feature and which don’t. I find it hard to believe that their most basic (i.e. cheapest) models have this feature, but I can’t find any information which ones have it and which ones don’t. Does anyone know definitively? If you can cite a URL that has this information, it would be even more greatly appreciated. Thanks!

Related posts:

1. I have a Magellan Roadmate 1200 GPS. Can I download voices to the device?
2. how do i download directions on my tomtom gps?
3. My home theater speakers wont work?
4. How do I download maps from Japan for my TomTom GPS?
5. Download Movies Because It’s Awesome