Snappers had reportedly been tailing the black Range Rover three-year-old Julian had been travelling in with his maternal grandmother, Joyce, and an assistant when the run-in occurred on Sunset Boulevard.
No further details about the fender bender were available as Wenn went to press, but editors at ETonline.com claim no injuries had been reported.
The celebrity couple, which announced its split on Monday (24Feb14), had reportedly left its only son with Patton's mother as the Mission: Impossible - Ghost Protocol beauty worked on location in Canada, while the tot's dad kicked off his delayed tour in Washington, D.C.
The accident took place shortly after Thicke told Tmz.com he was determined to fix his broken marriage and win back his high school sweetheart.
The Blurred Lines hitmaker said, "You know, I'm just trying to get her back... Just trying to figure it out, man."
The singer scrapped the opening show of his tour in Atlanta, Georgia last week (20Feb14) citing vocal problems, but reports suggest he actually flew to Canada to try and reconcile with his estranged wife.
He also axed a second show in Orlando, Florida last Saturday (23Feb14) and a third in North Carolina on Tuesday (25Feb14), but was back on the road in Washington, D.C. on Thursday.
The couple wed in 2005.