Blair and 5-month-old son Arthur laugh it up in Beverly Hills. Plus: Russell Brand, Rihanna, Katy Perry and more
Updated: Tuesday Jan 17, 2012 | 05:00 PM EST
More from PEOPLE
- Watch Jimmy Fallon and Zoë Kravitz Play a Giant Game of Beer Pong
- Read the Cover Story: What Caused This Teenager to Murder His Parents?
- Blonde Bombshell! Kim Kardashian Debuts Platinum Hair at Paris Fashion Week
- Here's What Needs to Happen in House of Cards Season 4
- 'Love Has No Labels' Video Aims to Address Our Inherent Biases