Should you ever feel the need to propose to that special someone in the middle of a game of Team Fortress 2, you can now do just that, after developers Valve added an official wedding ring to the game.
It's called the Something Special For Someone Special, and is available as a crafted item. It was added as part of a December 19 update to the game.
If you want to use it to actually propose, great! If not, I'm sure machinima creators will put it to good use.