As noted last week, Rihanna’s not-yet-titled fifth LP is due out by year’s end. Now Ryan Seacrest has announced that the first single, “Only Girl (In The World),” will premiere on September 7 on his official site. “An iTunes arrival date and album release date are yet to be confirmed,” says the American Idol host. “But word within the music community is that ‘Only Girl’ is an undeniable smash hit.” The track is produced by Stargate, so finger’s crossed it’s another “Rude Boy”-sized jam.