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A source has told X17 exclusively, that the reason behind Britney's week-long stay at the Four Seasons in Beverly Hills is due to an investigation by Child Protective Services into the security at Britney's two homes in Bel Air and in Malibu.

Our sources tells us that the government agency has warned Britney that the pools at both homes are unsafe for young children because they do not have the required child safey barrier around them. (We're uncertain whether either home is equipped with door alarms that satisfy the state pool safety requirement.)

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Given Britney and Kevin's ugly ongoing custody battle in which Kevin has reportedly refused to sign the divorce agreement because he is now seeking greater custody of the children (and therefore more $$$), I'm wondering if it's Kevin who alerted the state child welfare agency. Rumors have said he's resorting to dirty tactics in order to 'prove' Britney an unfit mother, which she most certainly is not.

X17online's source told us CPS visited Britney's Bel Air home three times last week and when she left to her Malibu home, they warned against the pool safety situation there as well so she left for the Four Seasons.

Meanwhile, the pool at Kevin's former Tarzana home was also without a barrier -- check it out HERE.

We've got more information coming soon about Britney's mystery manny and about her cousin Alli -- stay tuned!