Newly engaged Brenda Song (fiance is Trace Cyrus) flashed her blingin' ring in Beverly Hills on Saturday morning as she grabbed coffee and a pastry.

The actress kept things casual in Uggs and shorts, but paid homage to Trace by showing off her rocker side -- she sported a studded bag and a skull on the back of her sweater.

Song, 23, and Cyrus, 22, became engaged two weeks ago.