Credit: Jeffrey Mayer/WireImage.com

So much for that reunion.

RadarOnline.com posted a shot of James, 41, with a woman resembling his Oscar-winning ex, 46. The site claimed that Bullock joined him at his West Coast Choppers shop in Long Beach, Calif. Monday - the day after her Teen Choice Awards appearance.

But her rep tells UsMagazine.com, "It's not her."

TMZ.com says the woman is one of James' business partners, Hildie Katibah.

James and Bullock are on speaking terms, however, now that James has moved to Austin, Texas, where Bullock owns a home.

"Jesse would not relocate his family [Chandler, 15, Jesse Jr., and Sunny, 6] without consulting with her," an insider told Us.

PHOTOS: Sandra and Jesse, the way they were

Bullock and James split after five years of marriage following news that he carried on a steamy affair with tattoo model Michelle "Bombshell" McGee.