Today on Twitter, Mariah Carey roused up her 5 million followers by insinuating that she's got a Christmas gift to the fans on the way. No, it's not Dem Babies -- and she says it's not what we're thinking of, either, so that probably rules out the leaked 'All I Want for Christmas Is You' duet with Justin Bieber. So what does Mariah have up her sleeve, exactly? We can't wait to find out! Meanwhile, Jay Sean got his Halloween on; he witnessed a fight between a Nintendo character and a 'Ghostbusters' character while he was out drinking ... Or at least he says that's what he saw! Also, Royce Da 5’9″ tweeted that he's most thankful for his family, Bruno Mars spit tweet rhymes and Pete Wentz admitted to wanting a purse. See what your favorite stars were tweeting today!