Todd Rundgren and Karen Darvin dated from May, 1977 to 1985. They had 2 children.
Bebe Buell explains on her book "Rebel Heart" (p. 163):
My last two months of pregnancy [May and June 1977] were the toughest [...] While I was seeing Steven, Todd was in Texas with the new woman in his life, Bruce springsteen`s ex-girlfrien...
More about Karen Darvin and Todd Rundgren
Less about Karen Darvin and Todd Rundgren