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Britney Spears marked her
The X Factor co-star Antonio 'L.A.' Reid's
birthday this week (begs04Jun12) by presenting him with a cake and singing to him during filming of the hit show.
Spears, along with
Demi Lovato and Irish music mogul Louis Walsh - who is standing in for a sick
Simon Cowell - surprised Reid at the Kansas City, Missouri
round of auditions on Friday (08Jun12), a day after he turned 56.
The Toxic hitmaker presented her pal with ...