The “Kick Ass” actress and her “boo,” Cameron Fuller, spent Saturday running around Hollywood and – getting engaged. Well, not quite. But 17-year-old Fuller did get down on one knee to pop the question to the “Carrie” star with a pink plastic bauble, while she feigned excitement with her hand clasped over her mouth.

The pair, who’ve been friends since Moretz’s debut role in” The Amityville Horror,” which was produced by Fuller’s older brother, Bradley, chronicled their “big day” with plenty of Instagram photos – something these pals are known for. "@cameron_fuller #Macklemore looking good,” she posted of Fuller sporting a fur vest over his hoodie in a women’s boutique. Meanwhile, he affectionately addressed her as "Coco" on the photo site.

Moretz, Fuller (PacificCoastNews.com)Earlier this summer, the starlet called Fuller her#brother and #SecondFamily on Instagram, but based on his protective arm around her shoulder this weekend, it’s possible that their friendship has turned into something more.

Fuller, who is two years her senior, also meets Moretz’s dating criteria. “I like guys that are a little bit older, if they are cool and not completely immature ... I'll date one day if I find someone that I want to let into my life enough. I have to feel out the waters and see what's up," she told Seventeenmagazine in May 2012.

Whether these two are the next young “It” couple is yet to be determined – let’s just hope that if they make it to prom, it won’t turn out anything like her infamous scene in “Carrie,” which hits theaters later this year.