Michelle Bombshell's Sex Tape Partner -- I Also Banged Jesse James ... Sorta

Michelle Bombshell took the phrase "go eff yourself" a little too literally -- because TMZ has learned, she basically boned her XXX doppelganger in her sex tape ... a porn star who looks so much like Bombshell, girl actually played her in a porn spoof.

Her name's Emily Parker -- the one licking Michelle's toes -- and last year, she starred alongside a Jesse James-alike in the Hustler porn parody "Untrue Hollywood Stories: Jesse James" ... poking fun at Bombshell's affair with the famous grease monkey.

Sources close to Emily tell TMZ, Emily reached out to Bombshell on Twitter around the time of production, explaining she'd be portraying Bombshell in the skin flick -- and the two have been close ever since.