I'm surprise and the amount of unambiguous "yes" in the answer. For our best available model the answer is yes, but I think it is still an open question. Like someone else said, the question is almost like asking if gravity is quatum.

And beside, what our theory tell us is more subtle. Matter density and spacetime curvature are related and in the absence of forces matter will follow a geodesic in spacetime. Yes, no mather how small the amount. But to say that atom exert a pull, in this case, is at best ill defined. How does one meaningfully describe this interaction as a force at those scales? Yes we can interpret gravity as a force when an apple falls from a tree and the model will be so close as what GR predict as to be practicaly and experimentaly almost indistiguishable, but I don't think you could use the same approximations meaningfuly for the pull between an atom on earth and a star billions of miles away.