“The Hills” wraps up season three on Monday night (10 p.m., MTV) with the spotlight on Lauren Conrad, who says she makes a “life-changing decision.” People magazine talked to the star. “I gotta be honest, I haven’t seen the final episode yet. I know that something happens in our lives, but I don’t know what they’re showing. … Something very exciting happens in my life. I can’t tell you what, obviously, because it has to air, but it was a life-changing something.” People reports that Conrad is offered a second chance at living in Paris—something she stupidly turned down at the end of season one to be with Jason. MTV will air “The Hills Finale: Live in Hollywood” at 8 p.m. and a live after-show.