BRITNEY SPEARS - BRITNEY CHECKED WITH HER SISTER BEFORE SMOOCHING MADONNA

BRITNEY SPEARS called her little sister JAMIE LYNN before smooching with MADONNA at the MTV VIDEO MUSIC AWARDS to make sure she wouldn't be upset by what she saw on TV.

The pop star was concerned the impressionable 13-year-old would be appalled if she saw her big sister locking lips with Madonna, but Jamie Lynn understood the kiss was just make believe.

She says, "She was like, 'Jamie Lynn, don't be mad at me, but this is what I am going to do.'

"I was like, 'I'm not mad at you. I think it's cool.' My sister is so not a lesbian. It's called acting."