Taylor Swift -- B-Day Party Sold a Load of S**t

Not everybody was hatin' on Taylor Swift's celeb-crammed 25TH b-day bash in NYC -- a toy company just made a crap ton of money off it thanks to Justin Timberlake.

Turns out the takeaway from Taylor's now famous IG shot -- with Beyonce, Jay Z, Sam Smith, Haim, and JT -- was the poop emoji mask on Justin.

The people who make JT's turd face say they've seen a huge spike in sales since Taylor posted the shot. A rep for BigMouth Inc. tells TMZ they've seen a 315% increase and are almost sold out.

So, yeah ... #2 is now #1 on the charts.