The former Hills starlet, who just celebrated her 28th birthday, is honoring her first lovers' holiday as an engaged woman.
And what makes Feb. 14 even more important for the fashion designer? It also commemorates the day she first got together with her fiancé, William Tell.
"Happy Anniversary to my favorite Valentine <3," Conrad wrote on Instagram Friday morning to accompany a shot of her sweetly snuggling with her main squeeze, while displaying her engagement ring. "I love you dearly xo."
"Everyone is so happy for her," a source told PEOPLE at the time Tell popped the question. "He's such a great guy. They are perfect for each other!"