While stars like Nicole Richie, Kendra Wilkinson, Kaley Cuoco and more all showed off some flawless looks at QVC's 5th Annual Red Carpet Style Event in Hollywood on Friday night, it was the comedian who made the biggest fashion statement with her confection-covered mug.
Rivers was seen fleeing the Four Seasons covered in the delicious-looking treat ... and Miss Piggy is to blame.
In some video that popped up on YouTube, the two can be seen hurling insults at each other before Joan gets shoved into the cake.
Yes, it's all part of a viral campaign for the Muppet's new line of products for QVC ... but we have to admit, it's a pretty good one.
Check out the gallery above to see more photos from inside the party, including shots of Jenna Fischer's baby bump, Jenna Dewan-Tatum looking gorgeous, Kate Mara, Nick Cannon and more!