Brian Austin Green knows the secret to co-parenting. 

The Beverly Hills, 90210 alum revealed he has one rule for successfully sharing parenting duties with ex-wife Megan Fox. 

"The number one," Brian exclusively told E! News at Steel City Comic Con April 13, "is always make sure that everything is centered around the experience of the kids." (For more with Brian, tune into E! News tonight, April 15, at 11:00 p.m.)