They've been officially divorced for 2 and a half years.  Now, Nas is wanting that old thing back...especially after constantly having to perform his heartfelt "Bye Baby" song about his ex-wfe Kelis.  Check out his admission of recent ex-sexting inside...

Nas has been over in London making a few LIFE IS GOOD tour stops.  And at his Monday night concert at the Under The Bridge venue, he made a pretty shocking revelation at the end of performing "Bye Baby."

Mr. Jones told the audience he texted Kelis the other day and asked if they could get it in just one more time.  His exact words:

“I can’t lie to ya’ll, I text her the other day. and I told her, you know one of them nights when you just miss that shit? Can we just make love one more time?”

We all have those late night, possibly drunk, urges to hit up that ex.  But time will tell if it actually turns out to be a smart decision.  Peep the video:

Cuffing season is officially in full effect...