Melbourne, April 13 : Beyonce Knowles had to work hard and gather her nerves before she performed before legendary blues singer Etta James.
The R&B queen, who plays the 70-year-old veteran in her new movie Cadillac Records, confessed that she could feel the jitters as she sang her idol''s classic, At Last.
"You can only imagine how scary it is when you''re singing someone''s song dressed up as them,'''' the Daily Telegraph quoted her as saying.
"I knew she was very tough and my heart was racing. She had her arms folded and I was like, `Oh, my God! Don''t mess this up, don''t mess this up!''