Baby Talk with Gavin Rossdale

Parents of the world: If you weren't already jealous of Gwen Stefani and Gavin Rossdale for having two beautiful little boys, get ready to grow even greener with jealousy.

"It's going great!" proud pop Gavin says about life with 2-year-old Kingston and 2-month-old Zuma. "It's going really well... I just can't complain about it!"

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Gavin did confess that there is a wee bit of tension between the wee ones as they compete for attention and learn to get along as siblings. "That's just natural," he tells OK!. "That's really what happens. He's thinking, 'Who is this guy who is not leaving?' Obviously there are moments where he's bummed out that someone is in the spot with his mom. His mom is great, so I can agree with that." 

The rocker, who performed a handful of songs at Saturday's VH1's Save the Music benefit in L.A., also says he's realized that adding a second child gives you a new appreciation for math. "One is one," he explains. "But two is ten!"

With two musical parents, are the boys already planning their first concert tour?

"My older son Kingston... He has good rhythm, so I'm happy about that. But I don't push him beyond that. I let him enjoy it. He likes a good beat."

Speaking of getting a head start on things, Gavin and Gwen's boys have already gotten a jump on Halloween! "They're dressed now actually," he told OK!. "Kingston is an elephant and Zuma is a shark."