Hemsworth saddles up on the Mississippi set of his new Western film. Plus: Lea Michele, Alicia Keys, James Marsden & more!

THE HIGH NOTES

Bruno Mars looks perfect in paisley while belting out a tune at UCSF Benioff Children's Hospital benefit concert at the Bill Graham Civic Auditorium on Tuesday in San Francisco. "Tonight I Got to play in beautiful San Fran and meet Joe Montana #TodayWasAGoodDay," Tweeted the singer.