Sia & Erik Lang Call it Quits

Sia and Erik Lang are headed for splitsville -- they're breaking up after a short 2 year marriage.

The couple tells TMZ that "after much soul searching and consideration we have made the decision to separate as a couple. We are, however, dedicated to remaining friends."

The couple moved things pretty fast ... announcing their engagement back in June of 2014, and then tying the knot just 2 months later.