HEADING FOR A SPLIT?

JUSTIN TIMBERLAKE'S BAD BEHAVIOR IS COMING BACK TO HAUNT HIM - AND COULD DESTROY HIS 11-YEAR MARRIAGE TO JESSICA BIEL.

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IN late October, Justin Timberlake whisked his wife, Jessica Biel, and their two young kids away to Mexico for a sun-kissed vacation in Cabo San Lucas. Shortly after their arrival via private jet, Justin and Jessica were spotted hanging out poolside at their hotel. In photos, a bikini-clad Jessica can be seen chatting with Justin as he looks down at his phone.

It was a make-or-break trip for the couple. Justin, 42, has been under fire since the release of Britney Spears’ memoir, The Woman in Me, on Oct. 24. In it, the “Toxic” singer paints a lessthan-flattering portrait of the ’NSync singer, revealing he’d forced her to get an abortion during their three-year late -’90s/early-2000s romance and had been repeatedly unfaithful. The revelations have also caused major tension at home for Justin and 41-year-old Jessica (who share Silas, 8, and Phineas, 3) as divorce rumors run rampant. “It’s a nightmare that just won’t go away,” an insider tells Star. “It’s been very hard on their marriage.”

REPEAT OFFENDER

It’s not the first time Justin’s behavior has put his relationship with Jessica in jeopardy. Back in 2010, he was accused of cheating on her with actress Olivia Munn during a three-day tryst. The following March, the “SexyBack” singer and