Hayden Panettiere's 18th Birthday Bash

Hayden Panettiere celebrated her 18th birthday on Tuesday in a big way — a huge birthday bash at Malibu’s LG House!

75 friends and family partied with Hayden including Rumer Willis, Mario Lopez, Heroes co-stars Adrian Pasdar (and his Dixie Chicks wife Natalie Maines), Milo Ventimiglia, Greg Grunberg, Zachary Quinto, and new Heroes cast member Kristen Bell.

The food was Italian with pasta and Japanese with different types of sushi and rolls. The Birthday Cake was pink with a gold crown on top, purple frosted flowers. The cake said ” Happy Birthday Hayden” and made with red velvet cake.

After Hayden, in an LBD, blew out 18 candles (it took 5 tries to blow all the candles, she posed with family for pictures. She then followed that with photos with her long time beau Stephen Colletti who gave her a big kiss and hug. She thanked everyone for coming with a little speech. Hayden went traditional by cutting and eating the first slice.

Earlier in the day, Hayden registered to vote at the Declare Yourself offices in Beverly Hills.