Some couples exchange cards on their wedding anniversaries. Others exchange gifts.
Ellen DeGeneres and Portia de Rossi celebrate theirs in a more special way -- via skywriting.
The couple wed on August 16, 2008, and every year since an airplane writes out the number of years they've been married. Check out the photos below:
2012 (Ellen joked that the gap made it looks like "f our [anniversary]" instead of "four")
2012 (Ellen surprised Portia with this special message)
What a lovely tradition! Ellen and Portia will definitely need a panoramic camera for their thirteenth anniversary on -- that's going to be a lot of letters!
Ellen and Portia are one of the few married gay couples in Hollywood. Others include Rosie O'Donnell and her wife Michelle Rounds, Cynthia Nixon and her wife Christine Marinoni and Jane Lynch and her wife Lara Embry. For even more out celebrities, click on the "Launch Gallery" below: