‘Big Bang Theory’ Star Kunal Nayyar Accused of Screwing Agent Out of ‘Big Bang’ Cash

EXCLUSIVE 1120_Kunal-Nayyar_gettyAin”t no party like a Koothra-party! Especially for “Big Bang Theory” star Kunal Nayyar — who plays Raj Koothrappali on the show — because according to a new lawsuit … he”s been living it up big time without paying his agent.

Diverse Talent Group filed docs in L.A. County Superior Court last week … claiming Kunal owes his agency $100,000 in unpaid commissions for getting him the acting gig — a bill that goes back to September 2011.

The lawyer for DTG tells our sources, the agency repped Kunal when he got the job in 2007 — and the actor faithfully paid the piper ever since, but for some reason … he stopped coughing up dough last year.

Now, DTG is suing for its money, which it believes exceeds $100k.

Now here”s a twist … Kunal is currently repped by a different agency — Innovative Artists — so it”s bound to get messy.

Calls to Kunal”s reps were not returned.