The newly single Scott Disick hooked up with his ex Kourtney Kardashian's close friend and rock legend Rod Stewart's daughter Kimberly Stewart and later felt guilty about his actions, according to a US Weekly report.

"He feels like an a--hole," said a source about the "Keeping Up With The Kardashians" star, according to In Touch Weekly. "He was trying to get Kourtney back and was hoping she didn't find out."

As for 36-year-old Stweart, "[She] knew it was wrong, but couldn't help herself," the source added.

Rumors of their relationship started after Stewart and Disick were spotted partying together in Hollywood last month.

Stewart has a 4-year-old daughter from a previous relationship with actor Benicio del Torro. A representative for the "Stewarts & Hamiltons" star has rubbished the report, which also states that the pair had "multiple romps," calling the magazine's claims "untrue," according to Daily Mail.

Kourtney is not going to be happy, but sources say she has no intention of getting back together with Disick, in spite of having three children together: Mason, Penelope and Reign, E! reported.