Obtaining objects from a many-to-many relationship

I've got two models with one having a many-to-many relationship with the
other:

class A(models.Model):
name = models.CharField("name")

class B(models.Model):
haveone = models.ManyToManyField(A)

What is the idiom for getting all instances of A which are referenced in
B? I found this works:

A.objects.annotate(n=models.Count('b')).filter(n__gt=0)

But istm that there is probably a more concise and straightforward way
to accomplish this (and the solution is probably obvious but it is
escaping me). tia

- Tom

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