Frankie Jonas Tattoos Tana Mongeau's Name On His Leg: 'Who Would Be Stupid Enough To Do This?'

Frankie Jonas is paying permanent tribute to his honorary new sibling! After the 20-year-old brother of Kevin, Joe and Nick Jonas dubbed YouTube star Tana Mongeau a "Jonas sister," he tattooed her first name on his own leg. He filmed the wild decision for TikTok, and Tana shared her surprised reaction!