Ginuwine is heading towards marriage again ... 'cause TMZ has learned the R&B star is engaged to 28-year-old Miami realtor Jannette Escartin . Jannette tells TMZ ... Ginuwine popped the question in Washington, D.C., a couple of weeks ago ... and she said yes. The newly engaged couple tells us they're very happy and in love. Jannette says they met in South Florida a couple of years ago ... so they've managed to keep their romance almost entirely under wraps before deciding to take the next big