The 24-year-old singer proudly supported her new beau, Guilherme Vasconcelos, at his fight on Saturday night. WATCH: Demi Lovato Cozies Up to Boyfriend Guilherme Vasconcelos and Her Ex Joe Jonas Approves! "Team bomba," Lovato wrote alongside a Snapchat selfie ahead of the MMA fighter's match against John Mercurio. EXCLUSIVE: Demi Lovato Talks Getting Back Into Acting: 'I Have Too Many Tattoos Now' The "Stone Cold" singer's snaps didn't stop there, as she documented the whole fight for her followers, including Vasconcelos' victory.