The 42-year-old Spanish singer shared the first photo snuggled up to his baby, wearing a grey striped onesie, with the caption “My Sunshine.”
Kournikova, 36, shared a separate photo with the same caption, kissing her little one on the cheek.
The twins, named Lucy and Nicholas, are the first children for the notoriously private couple who have been dating for over ten years.
The babies were reportedly born in December 2017.