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Yes same thing happened to me the other week also. Unfortunately the thing that fixed it was a new head. The gasket looked perfectly intact, so somewhere my head has a crack or 2.
But I had milky oil.
I'd start with using the top off a coke bottle as a funnel on your radiator held on with electrical tape. This way you can see what's happening without coolant pouring out everywhere. Maybe pinch the over flow line so the coolant doesn't fill the overflow tank. If you've got consistent bubbling, then it may be bad news.
What condition is your radiator in? When you say overheating, is that indicated on the dash gauge?