Olivia Culpo is giving a special shoutout to her man on his 26th birthday ... penning a lovey note for Christian McCaffrey and sharing some steamy shots together.
The 30-year-old model posted a snap of the couple posing in their swimsuits on board a luxurious boat ... with the Pro Bowl running back smoking on a cigar.
"It’s someone’s birthday!!" OC said on Instagram. "I love you so much Christian. You are the most dependable, inspiring, thoughtful, + grounding person and I feel so lucky to call you mine.