Jessica Biel turned 43 years old on March 3, and to celebrate, her husband Justin Timberlake took to Instagram to share a heartfelt birthday post.

Justin Timberlake is catching some flack from fans after posting a video of himself slow dancing with his wife Jessica Biel in honor of ... Happy Birthday to my rock. My best friend.

Jessica Biel takes to social media to celebrate husband Justin Timberlake's 44th birthday. In the sweet tribute the actress details the "joy and challenges" of parenting with the Grammy winner.