Can't "He" see she's using him....

Actress Katharine McPhee 31.

Is dating composer David Foster 67.

Old enough to be her grandfather. 

Now one could say, 

"You don't need to be Psychic".

To see this won't work, I agree.

But the prediction part is,

 that this will end with one of them not surviving it.

I hope he has his will sorted. 

So as to foil her plans............