Hayden Christensen turned 36 on Thursday and to celebrate, his longtime love, Rachel Bilson, gave him a sweet shout-out on Instagram. The Nashville actress posted a close-up photo of Hayden staring off into the sunset on Instagram, writing, "Happy Birthday Handsome ❤️ we love you so much #10yearsandcounting #superdaddy #birthdayboy." The "we" Rachel is referring to is the couple's 2-year-old daughter, Briar Rose. Rachel and Hayden, who have been together since 2007 and are usually very private, have been sharing precious tidbits from their personal life lately. A few weeks after the former The O.C. star shared a photo of her Hayden kissing on Instagram in July 2015, she posted a photo of their daughter playing with bubbles in the park. Here's hoping we get even more from these two this Summer!