More than 100 guests (including Lisa Marie Presley) attended the non-denominational ceremony, which was held on the beach during sunset at the Four Seasons resort and performed by a local officiant. "We just love the beach, so we knew we wanted it to be at the beach," Pink tells PEOPLE.
Adds Hart, "We wanted it very fun and non-traditional. We're spiritual, but we're not religious. It was about being with our closest friends and family and having a very fun and loose party."
The medium for her message: She held up a sign that read, "Will You Marry Me?" On his following lap, the songstress wrote, "I'm serious!" It was an effective means. Hart scrapped the race and drove off the track to say yes. "I knew within the first few weeks after meeting her that I wanted to be with her for the rest of my life," Hart tells PEOPLE.
Pink, who is starring in the upcoming movie Catacombs, was keen on at least one wedding tradition: engagement bling. Partying at Hollywood club LAX in August, she happily flashed her diamond stunner when a friend asked for a peek.
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As for how he plans to show his devotion to Pink, Hart said, "Once we get married, I'm gonna tattoo her name down my ring finger. I'm a sap."
This is the first marriage for both Pink and Hart, who plan to go snowboarding along with their four dogs for their honeymoon. "They're so in love, and they're best friends," says wedding planner Kara Keaney. "They're perfect for each other."