Mickey Smith referred to the meeting of Rose Tyler and Sarah Jane Smith as "the missus and the ex", telling the Tenth Doctor "welcome to every man's worst nightmare". (TV: School Reunion)
When her previous incarnation appeared before the Twelfth Doctor, Missy noted "you've met the ex." (TV: World Enough and Time)
Upon the stored belongings of his many previous girlfriends being destroyed by a Dalek Executioner, Nick joked "ex, terminated." (TV: Eve of the Daleks)