Tanaka, 33, took to social media to share a picture of him and his lady relaxing oceanside in Cabo San Lucas.
Carey has been in Cabo San Lucas to enjoy a tropical vacation for her 47th birthday.
"Starting the anniversary festivities in a relaxing chic environment. #HappyAnniversary," Tanaka captioned the picture.
The dancer looked happy as he took the selfie while the birthday girl was seen smiling widely.
Carey also shared a picture of her sporting a form-fitting gold sequined dress and a pair of sunglasses as she poses behind a pile of gifts and a massive red bow.