“Cheers to you!” MTV VMA nominee Rihanna tweeted last night while posting the cover art for “Cheers,” the sixth single off her Loud LP. So let’s see…“Only Girl (In The World),” “What’s My Name” and “S&M” — a threepeat of #1s. “Man Down” and “California King Bed” — a disappointing (chart-wise) double-decker. Do you think the Avril Lavigne-sampling “Cheers” can match the success of the early Loud singles? And more importantly — where’s the single release for “Fading”?