The upcoming ‘Riverdale’ spin-off, ‘Katy Keene,’ is filling out its cast. reports that Zane Holtz and Katherine LaNasa have both been cast in The CW’s upcoming ‘Katy Keene’ pilot. Holtz will star as KO Kelly, and LaNasa will be playing Gloria Grandbilt. The two actors join Lucy Hale, who was previously announced as having been cast in the title role. KO is described as a boxer and Katy’s boyfriend. Gloria is a personal shopper at a luxury department store.