Best celeb social media pics: April 7

Hilary Duff shared this cute throwback photo with big sister Haylie.

Kylie Jenner posted this controversial photo on Instagram.

Nicki Minaj posed with Alicia Keys and Beyonce at the Tidal launch.

Rihanna celebrates her mother’s birthday.

Mariah Carey reunited with ex-hubby Nick Cannon for an Easter egg hunt with the kids.

Liv Tyler shared a first look at her son Sailor on Twitter.

Robert Downey Jr. shared this throwback photo from the set of Sherlock Holmes.

Ryan Reynolds showed off some very buff arms while posing for a picture with a young fan.

Kim Kardashian shared a sneak peek into the family’s Easter celebrations.

Kourtney Kardashian posted her first photo of son Reign Aston Disick.