The 36-year-old actress stars alongside Willaims in the CBS comedy 'The Crazy Ones', which premieres on September 26, reported Showbizspy.
The two play the father-and-daughter heads of a big-time advertising firm.
"Robin went on about Sarah and how lucky Freddie is to have her as his wife. Freddie replied he is a good husband and father and he likes to think that Sarah is pretty lucky too. Robin was flabbergasted - he didn't know how to take it," a source said.