Ain'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 TMZ, 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.
Mayim Bialik and her husband are getting divorced.
Mayim, who stars in "The Big Bang Theory," cites "irreconcilable differences" in her 9 year marriage to Michael Stone.
The couple has 2 kids. They've talked about how they allow their kids to sleep in the same bed with them.
Mayim, who previously starred in "Blossom," released a statement on her website saying, "The hands-on style of parenting we practice played no role in the changes that led to this decision," adding, "relationships are complicated no matter what style of parenting you choose."
And she says, "The main priority for us now is to make the transition to two loving homes as smooth and painless as possible. Our sons deserve parents committed to their growth and health and that's what we are focusing on."