Miley Cyrus and Britney Spears have taken to Twitter to support gay marriage, just days after Miss California Carrie Prejean sparked controversy during Sunday night's Miss USA competition when asked by celeb blogger Perez Hilton if more states should legalize same-sex marriage. Prejean stated her opinion that marriage should be between a man and a woman — and in the process has made an enemy of Hilton — but has also started a conversation among many notable celebrities on Twitter. "Love is love!" Britney Tweeted to Perez. "People should be able to do whatever makes them happy!" Miley Cyrus Tweeted...