His many marriages have kept the notorious biker bad boy in the spotlight, but the multiple wives and exes may be taking their toll on his youngest child, who at age 7 may be bounced between her biological mother, ex-con Janine Lindemulder; the mother of her half-siblings, Karla James; Sandra Bullock, who was Sunny's primary caregiver until her divorce from James in June 2010; and Kat Von D.
"Divorce is always disruptive for kids and it's an unfortunate situation for kids who have to go through this more than once," says Dr. Alan Hilfer, chief psychologist at Maimonides Medical Center in Brooklyn, N.Y. "This kid's going to be in for a bumpy ride."
Calls to Bullock's and James' representatives, and Lindemulder were not returned.
Though Sunny may be a high-profile case of a child with "multiple mommies," given that 46 percent of marriages in the U.S. involve a remarriage for one or both spouses, it's not uncommon for today's children and teens to face the adjustment of having one or more step parents.
ABC News asked child and adolescent psychologists to weigh in on how to smooth the ride for kids making such a transition.
One of the biggest issues for kids when dealing with any divorce, whether it's the first for the third, is the loss of stability and routine in their lives, psychologists say.
"The basic principle is that young children need to have stability in their lives, in particular regarding their caretakers," says Dr. William Bernet, a child and adolescent psychiatrist at Vanderbilt University. "They need to form trusting relationships with those people, whether that's a mom, a grandparent, a stepdad or even a babysitter. But in order to do that, they have to have that relationship over an extended period of time."
But when kids face multiple "transitions" from one marriage to another, one stepparent to another, the continuity of the relationship with caregivers is broken, says Robert Emery, professor of psychology at the University of Virginia and author of "The Truth About Children and Divorce."
"A remarriage isn't an hour at a wedding, it takes an adjustment [to the new parent] of two years or even longer," Emery says. "When you talk about multiple transitions, you're talking about a very large portion of a child's life lived in a state of uncertainty."
Children may become confused about authority and be unsure of what the new "rules" are going to be with the new parent. This can lead to rebellious behavior as the child resents the disruption this new parent poses in their lives, experts say.
But acting out isn't the only way that kids will show that they're struggling: They may become depressed and mourn the loss of the previous caregiver who has been cast off by their parent, they may become withdrawn, they might even become super well-behaved.
Some kids will become very well-behaved, Emery notes, but their apparent resilience belies their anxiety.