CHRISTINA AGUILERA - AGUILERA UPSET OVER HER OLD SONG

CHRISTINA AGUILERA has blasted her record company BMG, after they gave away a song she wrote to AMERICAN IDOL winner KELLY CLARKSON.

The star was stunned when labelmate Clarkson topped the charts with the Aguilera-penned MISS INDEPENDENT - and even more so when she discovered the talent show star was listed as a co-writer.

Christina says, "I'm like, 'OK, where did I approve this, and whose a** do I have to kick now?'

"It wasn't her fault, and I don't blame her, but we're on the same label, which is really messed up. So some people got phone calls, and in the end it's OK. It got worked out."