Beware: A real dumbass question

In a couple of weeks I will be travelling to Washington DC with a couple of bottles / magnum of champagne that I am buying at LHR DF. To avoid wasting about £100, are the customs guys at Dulles going to take my bottles off me because I am not 21 yet? I know the Americans can be quite anal when it comes to underage drinkers, as I found out in NYC.

Or should I just wedge them in my carry on for the short trip through to the free world?

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'There are only two emotions in a plane: boredom and terror'
Orson Welles (1915–1985)