Danny DeVito and Rhea Perlman -- We're Separating

Danny DeVito and Rhea Perlman are separating after 30 years of marriage.

The two married back in 1982 and have 3 children together.

DeVito (5'0") and Perlman (5'1") met in 1970 when Rhea went to see an off-Broadway play, The Shrinking Bride ... which featured Danny.

The two began dating soon after and lived together for 11 years before tying the knot.

A rep for the couple confirmed the split -- but has no further comment at this time.