Selena Gomez fans can’t “Calm Down” after the singer added fuel to the fire when it comes to engagement rumors. Amid buzz her beau, Benny Blanco, may have popped the question recently, the Disney Channel alum stepped out on Thursday, August 29, with a gold band on her ring finger. The ring was very visible in the photographs taken in Los Angeles, which pictured the Only Murders in the Building lead on a casual walk. In addition to the bling, the superstar rocked a makeup-free face, a pair of headphones and a T-shirt. Whispers about an engagement began in early August, as in an Instagram Story …