Yep, it's official: All your favorite '00s celebs are having babies. Justin Timberlake's a dad now, Ashlee Simpson is due any day, and Kristin Cavallari just announced she's pregnant with her third child. Now, you can add Haylie Duff to that pack. The Napoleon Dynamite star — and big sister to singer/actress Hilary Duff — has given birth to her first child, E! News reports. The 30-year-old cooking expert and lifestyle blogger and her fiancé Matt Rosenberg welcomed a daughter named Ryan this week. Bonus points for sticking to that boys'-names-for-girls celebrity trend. Little Ryan's arrival makes Hilary — who is mom to toddler Luca — a new aunt. Are we strangely jealous of a newborn baby who gets to call Lizzie McGuire auntie? Yes, yes we are. Welcome to the world, mini Material Girl.