Britney Spears has sparked fresh concern for her welfare after cutting off contact with her family, according to new claims, RadarOnline.com can reveal.

The Toxic singer, 43, is ignoring calls and refusing to answer messages, which has left her family desperate to check in with her. Article continues below advertisement

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Her " disturbing behavior " has been a worry for some time, but in recent weeks, fears have ramped up after she was snapped leaving a wine bar on her own, carrying a full Champagne flute before, disturbingly, climbing into her car and driving off.

An insider claimed: "She isn't returning texts, won't pick up calls, and won't even rea

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