The single mom was seen carrying her son wearing a pair of black skinny jeans and a white tank top.
Little Xander was sporting a blue camouflage top and a cap to shield his face from the sun.
It seems as though Jones isn't letting the recent rumors around her personal life get in the way of mommy duties.
Despite reports, sources told E! News that the Mad Men star "has nothing to do" with Hemsworth and Cyrus' engagement ending.
The announcement of their breakup came on the heels of reports that the Australian actor was caught sending naughty text messages to the blond star.
Hemsworth's rep vehemently denied the report, calling it "tabloid fiction," but it was the second time that he and Jones had been linked, the first coming when they were spotted leaving an Oscars party together back in February.
"January and Liam have not seen each other at all since the photos that were taken in February and they have not kept in touch," the source added.
The two were first seen getting cozy in Las Vegas at the Encore hotel nightclub XS on Saturday evening.