Katharine McPhee 'Succeeds In Business Without Really Trying'

Katharine McPhee comes out for the Broadway opening night of How To Succeed In Business Without Really Trying at the Al Hirschfeld Theatre on Sunday (March 27) in New York City.

The 27-year-old singer announced her presence by tweeting, “Heading 2 the opening night of “How To Succeed in Business without Really Trying”on broadway! Never been to an opening. Should be fun!”

Katharine celebrated her 27th birthday on March 25. She tweeted, “Woke up this morning 2 all the amazing Birthday mentions! Thk u to everyone makin me feel real special! Love birthdays! & Love u all!”

15+ pictures inside of Katharine McPhee learning How to Succeed in Business Without Really Trying…