United Kingdom, March 8 -- Sarah Michelle Gellar has enjoyed every moment of knowing Freddie Prinze Jr.

The 48-year-old actress marked her actor husband's 50th birthday with a sweet tribute shared to Instagram on Sunday (08.03.26).

Sarah posted a photo of the pair with the caption: "Happy Milestone Bday @realfreddieprinze Age is simply the number of years the world has gotten to enjoy you. And no one has enjoyed you, more than me. (sic)"

Some of the couple's celebrity pals, including TV personality Amanda Kloots, 43, The Real Housewives of Orange County alum Heather Dubrow, 57, and WWE wrestler Charlotte Flair, 39, also shared their birthday well-wishes for Freddie in the post's comments section.

Last July, Freddie reflected on his an...