Hollywood Headlines: A week in review

“Me + LANCÔME. #TGIF The secret’s out. And it feels GREAT. @LancomeUSA #Lancome,” Nyong’o tweeted. The Mexican-born Kenyan will be the first black ambassador for the makeup brand, which features Julia Roberts, Kate Winslet, Penelope Cruz and Lily Collins as spokeswomen.  (Jordan Strauss / Associated Press)

First at a Knicks game, later in Cancun, model Cara Delevingne and actress Michelle Rodriguez have been caught locking lips — except this time they wanted to be private. Delevingne took to Twitter after photos of their tropical trip (including topless-in-the-waves shots) surfaced, bashing paparazzi. “[Y]ou have no idea how valuable privacy is until you loose it!!!” she said.  (Frank Franklin II / Associated Press)

Janelle Monae and M.I.A. managed the physically impossible — making cameos at each other’s concerts across coasts — using holograms. M.I.A. joined Monae in Los Angeles for a verse of “Q.U.E.E.N.,” and Monae went to New York to jam on “Bad Girls.”  (Chris Pizzello / Associated Press)

An unsuccessful Kardashian selfie is rare, but still possible. Kim Kardashian freaked out when the baby elephant she was trying to capture onscreen moved toward her. Yes, photos of their interaction exists. See ‘em here.   (Richard Shotwell / Associated Press)

“I’m just calling all my fans, and y’all know I love y’all, thank y’all for all the support,” the singer said via speakerphone during a call with off-and-on girlfriend Karrueche Tran. Brown has been in jail since the middle of March.  (Lucy Nicholson / Associated Press)

After three decades in television, “Late Show” host David Letterman is calling it quits. During a taping Thursday night, he told his audience that he will retire in 2015 when his contract expires. Take a look at his greatest moments here.  (Jeffrey R. Staab / Associated Press)