I really do not care about celebrities wearing omegas (or any other brand) if they are getting paid to do so and advertise it.
NASA and astronauts wear speedmasters because they were chosen as the best watch and omega did not know about it a5 first...
I think that in the first pierce Brosnan movie he wore his own omega watch...
Personally
I would not choose a watch because (for example) George Clooney gets paid to wear it...
I would choose it though because NASA chose it and actually helped saving a mission...
Cheers