Last Saturday, under super-tight security, Jennifer Lopez and her beau of several months, dancer Cris Judd, as well as about 100 pals danced until 2 a.m. at Mortons restaurant in L.A. By the time the beaming couple bid goodbye and dashed into a waiting Bentley, PEOPLE reports in its latest issue, word was out: Lopez and Judd, both 32, are altar-bound. Judd, who first performed with Lopez in her video "Love Don't Cost a Thing" last November, gave her a diamond engagement ring in late May -- though Lopez later played it coy. "Wait and see," she told "Today" show host Matt Lauer in July when he asked about the couple's status. Now sources say that Lopez and Judd are planning a wedding this fall (his first, her second -- her 1997 marriage to Miami waiter Ojani Noa ended in divorce after a year). "I don't think it'll be one of those Hollywood monster weddings," says her friend, hairstylist Oribe. "It is going to be a bunch of friends and a lot of family."