"My longtime friends, Lily Tomlin and her love, the writer Jane Wagner, got married on the eve of 2014," Smith wrote. "My wish is that their happiness will be as great as their combined talents."
"They're very happy," Tomlin's rep said in a statement.
Tomlin and Wagner met in the early 1970s, when the Laugh-in star was reportedly looking for someone to help her develop a character.
Tomlin said back in August that she and Wagner were planning a December wedding.
"You don't really need to get married, but marriage is awfully nice," she said. "Everybody I know who got married, they say it really makes a different. They feel very very happy about it."