Do celebrities really use weight loss green tea?

While browsing the web for some weight loss products I found a natural product named weight loss green tea. That didn´t suprise me cause I have heard about it before and i have actually tried it couple years ago. But what did suprise me is that the website claimed that all the top celebrities like Britney, Lindsay and Paris Hilton are actually using it to keep theyr body slim. I imagine Weight Loss Green Tea might work but top celebrities like that could easily use something more expensive than the 5$ a pack green tea. Could it really be so effective?