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 ...