LOS ANGELES: Things are looking bleak for Sandra Bullock and Jesse James' marriage - another woman has come forward with allegations she romanced the reality TV star while he was wed to the actress.

The Oscar winner reportedly walked out on James last week (ends19Mar10) after tattooed model and porn star Michelle MCGee went public with claims she was intimate with the TV mechanic while Bullock was shooting The Blind Side on location.

And now a second woman has told U.S. publication the Star she had an affair with James that began in 2006 and ended last year (09).

Melissa Smith, 35, tells the tabloid that, like MCGee, she would visit James at his West Coast Choppers headquarters in Long Beach, California every few months for intimate encounters.

Smith's claims come as website TMZ.com reports James paid a former female executive at West Coast Choppers $700,000 (£437,500) in 2007 after she threatened to sue him for allegedly making sexual advances towards her.

The website claims James neither admitted nor denied the allegations in the settlement documents.