Sienna Miller has learned that some alcohol is priceless.

The stunning British star was enjoying a booze-filled weekend at the Isle of Whight Festival in London. However, not everyone agreed that she needed more alcohol.

When the actress went to the free VIP bar, she was denied another vodka drink. Sienna tried to fix the problem by pulling out cash. However, the bar tender refused to sell her a bottle of vodka for almost $200.

According to sources, the star was very drunk and other concertgoers feared she was close to throwing up.

The Sun newspaper reported that the "Alfie" star was "falling all over the place. She'd been drinking all day and even knocked a plant over."

Sienna is in England filming "The Best Years Of Our Lives" with Keira Knightley.

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