Katy Perry wrapped up 2013 with two very special private gigs, including one for Tv self-help guru DR. Phil Mcgraw's wife Robin.

The pop star serenaded Dr. Phil's wife at her 60th birthday party after hitting the stage as a surprise guest.

Oprah Winfrey and Vivica A. Fox reportedly attended the bash on 29 December (13) at MCGraw's Beverly Hills mansion.

Two days later, Perry was in Las Vegas for a private show at Caesars Palace's Fizz, where boyfriend John Mayer watched his lady from the wings.