R&B star Rihanna confirmed on Twitter Thursday that fans can expect a new album from her in just a few months.  When one of her fans inquired about a new set, the singer Tweeted back:  "This Fall!!!!!".  The album will be Rihanna's sixth full-length, and will be out less than a year after "Loud," which hit stores last November.  Rihanna is in the habit of releasing albums fast, having dropped a new record every year since her 2005 debut.