Serious Pimp is slapping Sitch with a lawsuit claiming the reality star made a deal to promote its t-shirts on the show, Facebook, Twitter and various other places.

According to the lawsuit, Mike Sorrentino and his brother had the right to approve the t-shirt designs, but never said yay or nay. They just disappeared, allegedly.

With the $25,000 advance he got.

I hope Serious Pimp had a well drafted contract!