Christina Aguilera Whose busty boobs?Cripes... steady as she goes, we think she's gonna blow.

This celeb cleavage is looking a little constricted.

This lady is packing them in.

But we're not so sure if her blouse can cope.

The weird thing is that this cleavage has only become prominent of late.

Prior to this summer she wasn't quite so blessed.

So where have these puppies sprung from, we wonder?

Well, as you might guess, we have a theory of our own.

Have a peek in our gallery to see the owner of this impressive pair.

And let us present the evidence for the case of the mystery growth spurt.