Tom Daley celebrates second anniversary with boyfriend Dustin Lance Black

Olympic diver Tom Daley has celebrated his second-year anniversary with boyfriend Dustin Lance Black.

The 20-year-old, who revealed he is gay in a YouTube video in December 2013, went public with his relationship just over a year ago.

Daley posted an old photo of the couple on Instagram, along with the message: "2 years ago I met my (frog) and my life changed forever! Thank you for making these past 2 years so special."

Black, who is an Oscar-winning director, shared the same image on his Facebook page and added the caption: "Two years ago we took a selfie just after meeting... the very moment my life changed forever. Happy Anniversary my love."

A photo posted by Tom Daley (@tomdaley1994) on Mar 22, 2015 at 10:21am PDT