Rumors of Nicole Richie's pregnancy have been swirling all week. Now sources are saying the slim "Simple Life" star is engaged, too. She (with rocker boyfriend Joel Madden in tow) turned up a Center Dance Arts benefit at the Beverly Hotel sporting a ginormous diamond engagement ring, according to the New York Post. In addition to the ring signals, Richie and Madden passed on the alcoholic beverages. Could it be because Richie's trying not to pull a Lohan, or is it because she's now eating and drinking for two?