Paul Pierce continues to be the butt of the joke after his viral raunchy twerking party last year -- his friends trolled him by getting a birthday cake with a picture from the infamous Instagram Live session ... and it's hilarious!!
Pierce, who celebrated his 45th birthday last Thursday, posted a picture of the cake on Twitter ... which poked fun at his NSFW gathering that led to his exit from ESPN.
On the cake is a pic of Paul -- who looks mesmerized -- pictured next to a scantily clad woman with the words, "Monica come through," and "Happy Birthday Habibi.