Jessica Lange and Sam Shepard
12/19/2011 AT 04:00 PM EST
Actress Jessica Lange and her longtime partner, playwright and actor Sam Shepard
, ended their relationship almost two years ago, PEOPLE has learned exclusively.
The couple, who have been together since 1982
, have two children, Hannah and Samuel, together.
"They both are pursuing independent lives," says a source.
Lange, 62, who stars as Constance in FX's hit series, American Horror Story
, was just nominated for a Golden Globe and Screen Actors Guild award
. She will be seen next in The Vow
, costarring Rachel McAdams
, in February.
A rep for Lange confirms the split – but has no additional comment. Shepard's rep could not be reached.