Selena Gomez speaks out in defense of BFF Taylor Swift. The 'Only Murders in the Building' star defends her bestie on TikTok, after an old 'Drop the Mic’ clip of Hailey Bieber dissing the 'Antihero' singer resurfaced. Selena and Hailey's husband, Justin Bieber, dated on and off for years. The two officially went their separate ways in 2018, and he married Hailey a few months later.