#MonicaBarbaro isn’t one to brag, so let us do it for her: As one-half of the high-chemistry couple at the center of the sexy new rom-com ‘One Night Only’ (and with several buzzy projects right on its heels), the Best Supporting Actress Oscar nominee is deservedly taking on a new mantle: America’s leading lady.  After years as stealing scenes from A-list men, (“My brain was in Nora Ephron. You want me to go to Scorsese. Got it!”) learn how the #onenightonly star is becoming a Hollywood mainstay on InStyle.com now.