“American Idol” Season 1 runner-up Justin Guarini is divorced from his longtime wife, Reina Guarini, and appears to be with a new woman … but the whole thing went under the radar.

According to court records obtained by TMZ, Justin filed for divorce in June 2024, after nearly 15 years together and 2 kids. The divorce became final in December 2025 … yet none of this ever became public.

So the divorce dragged on for more than a year … they finally reached a settlement around XMAS time.

Justin has already moved on and is in a relationship with a business coach named Kim Phillips.