erinmoran "Happy Days" co-star "Happy Days" cast member She played Tom Bosley's TV daughter She played Joanie on "Happy Days": 2 wds Joanie Cunningham portrayer on "Happy Days" "Happy Days" actress Joanie Cunningham portrayer, in 1970's-80's TV Co-star of 36-Down She played Joanie on "Joanie Loves Chachi"