Jennifer Lopez and her ex-husband Ojani Noa are caught up in an IRS investigation that includes payments the 'Love Don't Cost A Thing' singer has been making to him, RadarOnline.com has learned exclusively.

Noa was questioned by IRS investigators on October 7, 2010 and under oath questioned specifically about a discrepancy concerning payments J.Lo made to him, according to Ed Meyer, who represents Noa.

"The IRS told Noa that the 1099 form JLo submitted to them was almost double what he put down that she paid him," Meyer told RadarOnline.com exclusively.