Little Bob and Max Sheen turned two over the weekend and received the best birthday gift of all: a party that did not include their mentally unbalanced father.

The twins were feted at a backyard shindig hosted by Kathy Hilton and attended by such guests as Nicky Hilton, David Katzenberg and Adrienne Maloof. Brooke Mueller was especially relaxed at the event, a witness says.

“Brooke seemed to have a good time… she seemed focused on her kids and nothing else,” an onlooker told Us Weekly. “There was a lot of security outside at all times to make sure no uninvited guests got in. There was no

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