From left: Britney Spears, Simon Cowell, Demi Lovato and L.A. Reid
09/20/2012 AT 10:00 AM EDT
Auditions continued on The X Factor
Wednesday – but on night three of the second season one singer stood out from the crowd of contestants for her sheer star power: judge Britney Spears
The superstar showed off her vocal talents by performing a classic tune, "Happy Birthday," for co-judge L.A. Reid, who turned 56 on June 7, when the show was taped. (Watch the video here
It was a treat for fans of Spears, who rarely goes a cappella on TV.
And there were no harsh critiques from judge Simon Cowell
, who was out sick
during this part of the auditions.
He was replaced on the panel by Irish music manager Louis Walsh.
Wednesday's episode also showed the taping in Kansas City where the judges first walked out of the auditions after contestant Deangelo Wallace performed a shamelessly bad version of "With You" by Chris Brown
Wallace, 19, left with the $3,000 microphone and was later arrested by police.