"Cobra Kai" stars Tanner Buchanan and Mary Mouser debuted their relationship on the red carpet for the Season Six, Part Three premiere of the Netflix show Feb. 12. Their hard-launch at the Los Angeles event doubled as an engagement announcement when they flashed their left hands,

Cobra Kai stars Tanner Buchanan and Mary Mouser just hard launched their relationship — and their engagement — following years of speculation from fans. The longtime co-stars shared a joint post on Instagram on Thursday to announce their engagement.