Hailey Bieber is by husband Justin’s side through it all. On Saturday, October 19, the new mom supported her man during his surprise performance at Don Toliver’s concert in Los Angeles, which marked a rare onstage appearance for the pop star, as he’s dialed back his career in recent years. Hailey, 27, documented the special evening via social media, where she shared a video of Justin, 30, performing in a white beanie and an otherwise all-black ensemble, featuring a hoodie and oversized pants. The “Baby” singer hit the stage at Crypto.com Arena for a live rendition of Justin and Don’s 2023 song…