Mary J. Blige, Warren Beatty, Brett Ratner, Kristen Bell and more celebrate 100 years of The Beverly Hills Hotel; Emily Deschanel and Kevin Nealon step out for animal rights; Maria Menounos has a birthday blowout at her home; Elizabeth Banks, Michelle Pfeiffer and Chris Pine hit the 2012 L.A. Film Festival for the premiere of their new movie—get your weekend event roundup in this edition of Last Night's Parties.
Photos: Maria Menounos' Birthday Bash [via], Michelle Pfeiffer, Chris Pine [via]
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