D&C 130

The Lord revealed - 

"The angels do not reside on a planet like this earth;

7 But they reside in the presence of God, on a globe like a sea of glass and fire, where all things for their glory are manifest, past, present, and future, and are continually before the Lord."  (Doctrine and Covenants 130:6–7)

The Lord also revealed - 

"There are two kinds of beings in heaven, namely: Angels, who are resurrected personages, having bodies of flesh and bones—"  (Doctrine and Covenants 129:1)

And - 

"Secondly: the spirits of just men made perfect, they who are not resurrected, but inherit the same glory."    (Doctrine and Covenants 129:3)

I believe that those angels referred to in Section 130 are "beings in heaven".