Megan Fox had a star-studded, sparkle-filled birthday this week. The newly 36-year-old actress joined her fiancé, Machine Gun Kelly, at the Billboard Music Awards on Sunday before heading to her own celebration immediately afterward. «It's my fiancée's birthday at midnight so we are celebrating her wonderful night,» the reported from Kelly on the BBMAs red carpet. The couple hosted the event at Tao nightclub in Las Vegas, where they were joined by Mary J.