Nicole Richie: Engaged!

Richie and Goldstein (at a Beverly Hills cafe in September), who have been together for a year, have already moved in together in the Hollywood Hills. They have not yet announced a date for their nuptials.

Will best pal and Simple Life cohort Paris Hilton (with Richie at Mariah Carey's Halloween bash in New York) be a bridesmaid at the wedding?

Whispers of an engagement first began swirling back in September when Richie (with Goldstein outside L.A. eatery Koi on Jan. 17) opened a ring box containing a $3,750 bauble at a Vera Wang show during New York Fashion Week. But the gem turned out to just be a gift from jewelry designer Judith Ripka.

Richie, who lost 10 lbs. thanks to regular workouts with L.A. trainer Adam Irnster, has been dressing more demurely than in the past. Perhaps these looks (left, in December; right, in November) are an indication of the type of wedding dress she'll select.

Richie and Goldstein share a smooch to ring in 2005 at a New Year's party thrown by Wilmer Valderrama and the Black Eyed Peas at Miami hotspot Mansion.