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Talk about a lucky 4-year-old! That's right, four.

Gwen Stefani and Gavin Rossdale threw a quiet little b-day bash for son Kingston's 4th birthday at their Los Angeles home on May 29th, and a source tells Us that the event cost a whopping $15,000 bucks! Extravagant much? You could buy a brand new car with that kinda dough!

The party catered to 100 guests (including celebs like The Beckhams and Kate Beckinsale) and featured these luxury items: a cotton candy machine, a lemonade stand, a bouncy castle, three birds, a face painter, a balloon artist and roaming superhero characters.

Spared no expense!