Angelina Jolie Worried She's Losing Brad Pitt to Jennifer Aniston?

Angelina Jolie and Brad Pitt have taken the Jolie-Pitt brood abroad again.  Brad Pitt's ex wife Jennifer Aniston is still in California, alone, as her on or off sweetie (who can tell?) Vince Vaughn is also abroad.

Angelina Jolie Worried She's Losing Brad Pitt to Jennifer Aniston?

So - why should Jolie be worried about Jennifer?

Life & Style Weekly says that the puffy lipped siren became concerned when it was being reported that Jennifer and Vince had called it quits.  A friend tells the magazine, "Angie's worried about Jen being available."

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Other reports claim that Brad has been trying to get Jennifer to take his calls and has even resorted to e-mailing his ex-wife to feel her out on film projects.

"(Angie) knows Brad has been missing Jen and now Angelina doesn't think there's anything that will prevent Jen from responding to his calls," the insider tells the weekly entertainment magazine.

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Recent reports claim that Jen has denied that she and Vince are split.

But the article also notes that Brad's mom Jane still keeps in touch with Jennifer and other reports have been adamant that Jane favors her son's ex Jennifer over Angelina. 

But withy three kids, and Jennifer constantly denying any interest at all in any kind of reconciliation with Brad Pitt should Jolie really be worried?

--Tina Sims writes from Miami