1 of 10
A BLOWOUT NIGHT
“The entire night was perfect,” says Simpson of her July 9 bash at her parents’ Encino, Calif., estate. “I’m still smiling!” As 150 guests – including Jake Gyllenhaal, Wilmer Valderrama, Mandy Moore and little sis Ashlee – looked on, Simpson worked at the trick candles on her Betty Boop cake. “She’s full of hot air, but even all of her wind couldn’t blow them out,” jokes husband Nick Lachey.
2 of 10
Simpson’s longtime hairdresser Ken Paves gives the singer a final touch-up before the festivities.
3 of 10
WHAT SHE GOT
As a birthday surprise, Lachey tricked out Simpson’s Range Rover with a new set of rims. “I’ve been wanting them forever!” she says.
4 of 10
WHAT THEY GOT!
The b-day girl gets to the point with pal Gyllenhaal, who was among the guests with plenty to celebrate: Everyone got gift bags by Silver Spoon stuffed with goodies like Paul Frank backpacks, Wolfgang’s Vault vintage music tees, Lush, Benefit and Rosie Jane cosmetics and workout gear from Hard Tail.
5 of 10
Partygoers – including Drew Lachey, Joaquin Phoenix, Topher Grace and JC Chasez – could lounge by a candlelit pool, which was filled with mechanical fish.
6 of 10
The dance floor hopped until 2 a.m.; some guests stuck around well past 3.
7 of 10
Eighties cover band the Spazmatics ended their set with “Rebel Yell” and “Happy Birthday.”
8 of 10
MOORE, THE MERRIER
Mandy Moore stands tall by Simpson, who also got a birthday squeeze from singer Macy Gray and was joined by J.Lo’s ex Cris Judd and Backstreet Boy Kevin Richardson.
9 of 10
It’s a family affair as sister Ashlee (far left), Simpson and father Joe huddle with actress Eva Mendes.
10 of 10
“Twenty-five is going to be a good year for me,” says Simpson (with Lachey).
Va-va-voom! Jennifer Garner Pumps Up the Glamour in Sexy Red Velvet Gown
Bella, Candice, Lily and More! See All the 2017 Victoria's Fashion Week Models in Shanghai
Victoria Beckham, Nina Garcia and More from the Fashion World Mourn Death of Designer Azzedine Alaïa
Victoria’s Secret Announces Fashion Show Performers in Its First Statement from Shanghai
Serena Williams' Wedding Dress Photos Are Here! Get All the Details on Her Custom Gown