Here's what's happening today in pop culture:
• "The Great Gatsby" made an impressive opening, old sport, taking in $51.1 million this weekend. But it still only rated a second-place showing, behind "Iron Man 3," which took in $72.5 million in its second weekend. [Box Office Mojo]
• "Saturday Night Live" head writer and "Weekend Update" anchor Seth Meyers will take over NBC's "Late Night" when Jimmy Fallon moves up to hosting "The Tonight Show." [CNN]
• It's official: Barbara Walters will announce her retirement, after a half-century in news, today on "The View." Her departure takes effect next year. [The Hollywood Reporter]