Britney Spears looks fabulous and very happy on January 15, 2010. According to the photog, Britney Spears quickly shopped at Barnes and Noble before jaunting off for a nail appointment in Calabasas, CA. The onlooker added that Britney read the latest gossip in a new copy of Us Weekly. Check out Britney's sweet smile - very cute!

In related news, Us Weekly is reporting that multiple sources are slamming a recent tabloid claim that Britney Spears' lovie dovie Jason Trawick cheated on the singer at L.A. club Roger Room Dec. 30, 2009 - including Milana Rabkin, one of the women spotted with Jason Trawick on the night in question. A source of the magazine's website explains that the December 30, 2009 party was a birthday celebration for "one of Jason's bosses". End of story. Photos: Fame Pictures