Hough is downright giddy with Seacrest in L.A. Plus: Channing Tatum, Madonna, Kim Kardashian, Chris Hemsworth, Rihanna and more

CITY GIRLS

No sibling rivalry here! Kourtney and Kim Kardashian stay in step during a stylish outing (with sis Khloe picking up the rear!) Thursday afternoon in Studio City, Calif.