The 31-year-old actress/singer then made her way to The Late Late Show where she promoted her show Scorpion and sang tax day themed Christmas carols with host James Corden – Check it out below!
That same evening, Katharine was spotted arriving at The Ace Hotel to attend the Florence + The Machine concert in Los Angeles.
Tax Day Carols with Katharine McPhee & James Corden
10+ pictures inside of Katharine McPhee out and about… More Here! »