Sandra Bullock's XXX Stepdaughter

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Sandra Bullock is finally a mother. Sort of. Mom to the five-year-old heir to a porn legacy.

The National Enquirer reports that the 44-year-old Speed star is assuming full-time motherhood duties to her husband Jesse James' daughter—whose biological mom happens to be disgraced former porn star Janine Lindemulder. 

Lindemulder, the 40-year-old star of such blue-movie classics as Where the Boys Aren't 10 and Janine's Got Male (she also served as the cover model for the Blink-182 album Enema of the State), was sentenced to six months in prison last month for willfully failing to pay more than $200,000 in outstanding federal income taxes.

Now a family court judge has granted James temporary full custody of his and Lindemulder's daughter, Sunny, while Lindemulder serves her sentence.

The judge's order bolsters the adult-film actress's long-standing fear that she'll lose custody of her daughter to James and Bullock.

Lindemulder had been warring with James—the former star of Monster Garage and owner of motorcycle empire West Coast Choppers—over custody of Sunny. Back in July, when she was indicted on the tax-evasion charge, she angrily texted a message to her ex stating, "U WIN. Sandra has her baby…congrats."

"This is a dream come true for Sandra, but it's Janine's worst nightmare," a source tells the Enquirer. "Now that Janine's going to prison, her fears of losing Sunny are one step closer to becoming a reality."

Lindemulder was married to James for 13 months until 2003, when they split up while she was seven months pregnant. Bullock began dating the 39-year-old motorcycle builder several months later, and the two married in 2005.

Surely Bullock will make a fine temporary mother. But if the tot ever asks Sandra if she recommends going into the family business, stepmom had better ask the girl which one.