Nicole Richie flashed her engagement ring in New York last night as she announced on David Letterman's show that she is engaged to Joel Madden! Nicole was spotted shopping at a bridal dress shop with Joel's brother, Benji, last week, so it looks like wedding preparations have already started. The excited couple, who are parents to Harlow and Sparrow, met up after the show for dinner at Abe & Arthur's. Congratulations to Nicole and Joel!
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