Nick & Jessica's Troubled Year

See the highs and lows of PEOPLE.com's Most Fascinating Couple of 2005. By Emily Fromm

JULY 9

The pair celebrated Simpson's 25th birthday, along with 150 guests, at her parents' Encino, Calif., estate. When she couldn't extinguish the trick candles on her cake, Lachey joked, "She's full of hot air, but even all of her wind couldn't blow them out." His gift to her? New rims for her Range Rover. "I've been wanting them forever!" she said.