Whitney Houston was reportedly so scared of forgetting the words to her hit songs at her recent comeback concert in London, she had the lyrics taped to her dressing room wall.

The singer stepped onto the stage at the Caudwell Children Legends Ball on Thursday evening, where she stunned the packed venue with her greatest hits.

And Houston, who is set for a career revival with a new album later this year, was determined not to make a mistake during the performance. So the hitmaker asked for the words to all the songs to be printed out and displayed in her dressing room - so she could memorize them thoroughly before going onstage.

A source tells British newspaper the Daily Mirror, "Whitney was really nervous before her set. She didn't make any diva demands, and was polite to everyone. She spent 45 minutes reading the lyrics, mouthing the words and holding her hands as if in prayer."

And the hard work paid off as the superstar went on to wow the crowd with a flawless performance.

(This news article provided by World Entertainment News Network)