Kicking off a week of celebration for a summer staple, Nikki Reed was on hand to host 7-Eleven's 86th birthday celebration on Tuesday (July 9) in Malibu, CA.

The "Breaking Dawn" beauty wore a floor-length sleeveless grey gown as she posed with her refreshing, icy Slurpee outside one of the chain's stores.

Also in attendance at the big event was "Hills" star Audrina Patridge, who donned striped shorts and a black blouse while posing with her flavored treat.

As part of the chain's celebration, their signature Slurpee's will be free for customers in the United States and Canada from 11 a.m. to 7 p.m on Thursday, July 11.