It then chucked it down once Webber had accepted the trophy from Prince Albert, sprayed the champagne and hugged Red Bull designer Adrian Newey.
It was Webber's first win since Brazil at the end of last season, the eighth of his career and Red Bull's third in a row -- all from pole - around the treacherous metal-fenced streets and crowded harbour side of the millionaires' playground.
There remained a question mark over the result, however, with talk sweeping the paddock ahead of the race of a possible protest by rival teams questioning the legality of his Red Bull's floor.
Red Bull rejected that and Webber, winner in Monaco in 2010, was ready to party. He stood on his car and punched the air in triumph.
In Image: Red Bull driver Mark Webber of Australia celebrates his victory diving in the pool of the motorhome after winning the Formula One Grand Prix