The Good Charlotte guitarist and the actress have famously kept their relationship private since they began dating in 2014 and married less than a year later.

"Every year only gets more fulfilling," the musician wrote on Instagram, celebrating both a decade of marriage with Diaz and her new movie 'Back in Action'

"Every year only gets more fulfilling," the rock star said of his relationship with the actress.

In honor of 10 years of marriage earlier this month, Benji Madden shared a rare selfie photo Jan. 17 with wife Diaz, gushing over his "queen" in the caption.

Cameron Diaz is back on screen after an 8-year hiatus with Back in Action. Her husband, Benji Madden, celebrated her return with a heartfelt Instagram post, calling her "my queen." He praised her for being an incredible wife,