Watch Idina Menzel Perform Lady Gaga’s 'Poker Face' in Barefoot at the Symphony

In her latest solo concert special, Idina Menzel Live: Barefoot at the Symphony, Tony winner Idina Menzel shares the hilarious story behind her performance of Lady Gaga's “Poker Face” on Glee. After giving birth to son Nathaniel Diggs with fellow Rent alum Taye Diggs, the Broadway veteran came to a startling revelation: “I’m fat and I need a job.” So when asked to play the mother to 25 year-old actress Lea Michele on Glee, the 40 year-old stage diva took on the role with a “glass half-full” mentality despite the obvious idiosyncrasies. Click to watch the Wicked star go Gaga below and be sure to check out the concert DVD when it hits stores March 6.