36 years old (Born on May 15, 1989)
Happy Birthday, Gianna! It might have been years since Stacy's Mom had it going on, but you're forever immortalized as everyone's favorite crush next door. No matter how many birthdays pass by, you'll always be the timeless face of teenage nostalgia—so here's hoping your cake is sweeter than a pop-rock anthem!From capturing hearts in one iconic video to embracing life's exciting adventures off-camera—you've truly proven that coolness never ages out. So today we celebrate you and every wonderful milestone ahead; keep shining brightly (and thankfully we're old enough now that no moms are required!) Cheers to another fantastic year!