© PA Images
McLarty accompanied Arquette to the Camp Playboy event at Comic-Con in San Diego last weekend, with an eyewitness telling People that the rumoured couple "danced the night away together".
Arquette and McLarty also attended other Comic-Con events together throughout the weekend, the source added.
Francis and McLarty split in December 2010, just a month after they held a commitment ceremony in Punta Mita, Mexico.
Arquette and wife Courteney Cox confirmed their own separation last October after 11 years of marriage. They are the parents to daughter Coco Riley.
Conception, starring Arquette and Connie Britton, is expected to be released later this year.
> David Arquette thrown out of Prince gig
Watch David Arquette in the Conception trailer below:
