It wasn't for very long, but he was freestanding in the kitchen for a good 20-30 seconds with no prompting from me. Alas, I didn't have the camera around, but he had a good sumo squat going for a bit.
The diaper would cover more on Garrett though.
He's also got a new game where he'll hold onto the edge of the playpen and squat down and if someone says, "Where's Garrett?" he'll pop up and give you a big grin, but only if you say, "OH THERE'S GARRETT!!"
He can do that for 10-15 minutes :)