From Billboad.com:

MTV Europe Music Awards: Lady Gaga, Justin Bieber Lead Invasion
Queen & K-Pop's Big Bang Are Only Non-North American Acts to Win

"The inaugural worldwide act award went to Korean boy band BIGBANG, representing Asia Pacific."

+) They tagged a different BIGBANG in the article though:
From Music Japan:

"Next to international stars that have been know for long, such as Lady Gaga, Linkin Park and Justin Bieber, South Korean boy-group BIGBANG also managed to earn one of the precious trophies!

In the category "Worldwide Act", the five members, who also released the only non-English speaking EP in the US to ever hit the top 100 within the iTunes charts, received the most votes. They showed that their popularity eventually reaches past their home country and past Asia into the world."

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From Yahoo Australia:

The surprise win of the night went to Korean boyband BigBang, who beat off competition from acts including Britney Spears to take home Best Worldwide Act while Eminem picked up the Best Hip Hop artist.

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From MTV.tv:

Ecstatic Korean boy band BIGBANG were the surprise winners at the awards, capturing the inaugural Best Worldwide and beating off some of the world's biggest stars in the process.