R.-Kelly*There’s no question that R. Kelly has made a career of pushing the envelope musically, but the singer could potentially see the inside of a jail cell if he does the same legally.

Sources tell Pagesix.com that Kelley’s lawyer is afraid his client may be jail bound for allegedly falling behind on child support payments.

Court papers filed Thursday by Kelly’s ex-wife, Andrea Kelly, accuse the entertainer of failing to pay $20,833 a month in child support he owes.

In addition, Kelly’s camp received a wake up call from one of the singer’s attorneys, who told them that a judge could give Kelly 30 days to six months in a jail cell if he fails to appear at a March 27 hearing in his child- custody battle in Chicago. The reason behind the potential outcome stems from Kelly no-showing at a hearing in November.

“The judge was clear in November that he wasn’t happy R. Kelly didn’t show up,” a source told PageSix. “His lawyer [James Quigley] is worried the judge could lock Kelly up if he doesn’t show this time, but he can’t reach his client.”

Despite the drama, Kelly has seemingly found relief. Multiple sources tell PageSix that Kelly is “in a bunker” and “unreachable.” However, if the “Feelin’ Single” vocalist doesn’t make an effort to get in touch, a source said that Quigley’s firm may have to withdraw from the case.

Kelly isn’t the only client experiencing a rocky relationship with the firm. PageSix’s source added that thousands are owed to Quigley’s firm while it’s in the middle of custody negotiations with Andrea Kelly, who stars on VH1’s “Hollywood Exes.

The claim against Kelly comes after he reportedly fell behind more than $100,000 in payments last year, but paid the debt off.

Kelly is currently with Devyne Stephens’ Upfront Megatainment after leaving top music firm Red Light Management. That’s well and good, but the new alliance isn’t a solid way out.

“There’s a line of people Kelly owes money to who worked really hard on his last album,” another source shared with PageSix. “Who knows what Kelly and Devyne are doing, but burying your head in the sand isn’t the answer.”

Kelly’s tax trouble included auctioning one of his homes off this year upon owing millions in unpaid taxes.

As for Stephens, records show that him filing for Chapter 7 bankruptcy in 2012, which was denied. He was hit with five tax liens since 2004 that were paid off.