Shameless cheater Mel Gibson hid a secret family from his long-suffering wife Robyn, shuttling them from one pricey property to another, The ENQUIRER has learned exclusively.

"These are crazy days at Camp Gibson!" a longtime family friend told The ENQUIRER.

"There seems to be a new bombshell every day. Robyn is heartsick, and Mel’s kids are terribly disappointed in him."

Meanwhile, the 53-year-old Oscar winner is keeping a low profile with his secret family – Russian beauty Oksana Grigorieva, 39, and her 11-year-old son Alexander.

"Mel is taking things one day at a time," another source confided. "He’s pretty shaken up, but he’s definitely in love with Oksana."

The sultry brunette has filmed four music videos with Gibson in Mexico City and has custody of her son, whose father is 63-year-old British actor Timothy Dalton. He played super spy James Bond in thrillers The Living Daylights and Licence to Kill.

Oksana and son now live in a ritzy mansion in Sherman Oaks, Calif., that Gibson bought for her late last year, sources say.

Before that, Gibson housed his secret family in an $11 million oceanview spread in Malibu that he bought from X-Files star David Duchovny and his actress wife Tea Leoni, according to an insider.

 "It’s close to the Gibson family compound in Malibu, so it was convenient for Mel," said the insider. "He could be with Oksana and Alexander, and still be just minutes away from Robyn and their children."

For the full story with all the details in the Gibson Divorce Scandal time-line  and to learn the identity of Mel’s other secret lover RUN – don’t walk – to get the latest ENQUIRER – still on sale!