Hmmm, it kinda depends on the environment but if it's like a café or a disco, walking up to her would be no problem I think. If you read the signs right you don't have to worry about seeming stupid. Oh and just for the record when a guy does something stupid and it makes us laugh that's never a bad thing At least you got her attention right ?
~The 3 things needed for Happiness: Something to do, Something to love and something to hope for.~
I am no expert, take everything I say with a large grain of salt.