"This Is Us" Star Milo Ventimiglia was spotted wearin' a ring on that finger ... and we've confirmed the actor has tied the knot with model Jarah Mariano in a secret ceremony.
Milo and Jarah were watching Saturday's Rugby World Series match at a restaurant called Yahir in Los Angeles -- but the big game between New Zealand and South Africa wasn't even the most interesting thing going on at the establishment.
Check out the bling on Milo's left hand -- Jarah could even be seen touching his ring while they enjoyed their time together.