Recurring
Daniel Breaker as Scott, Dawn's husband, a school counselor unaccustomed to fame.
Jonathan Hadary as Larry Plumb (seasons 1-2), Girls5eva's sleazy former manager and founder of Plumb Management and Junk Removal
Ashley Park as Ashley, the fifth member and the self-proclaimed "fun one" of Girls5eva, who was the glue of the band, having been a member of six previous girl groups. She died in an infinity pool accident in 2004 and was memorialized by a bench paid for by her bandmates.
Erika Henningsen as young Gloria
Andrew Rannells as Kev Hamlin, a former boy band member and Summer's long-distance husband who works in Tampa, Florida as an entertainment reporter
Jeremiah Craft as Lil Stinker, a rapper who samples Girls5eva and brings them back to prominence
Janine Brito as Caroline, Gloria's ex-wife
Grey Henson as Tate (season 2), a young executive at Girls5eva's new record company, "Property Records"
Piter Marek as Ray (season 2), a talented sound engineer/producer/songwriter who helps Girls5eva write their album
John Lutz as Percy (seasons 2–3), a victim of a 2000s era prank show featuring Girls5eva and later their assistant on their comeback tour
Chad L. Coleman as Sheawn (seasons 2–3), a "lunch lord" and love interest of Wickie
Thomas Doherty as Gray Holland (season 3), a world-famous musician who befriends Gloria.
In addition, Julius Conceição costars as Max, Dawn and Scott's son, a "New York Lonely Boy", and Penelope Richmond as Stevia, Summer and Kev's daughter (seasons 1-2).
