This happens with almost EVERY song nowadays. I'm not surprised.

Everyone thinks that anything new is a rip-off of something old. I don't really see the similarities between Britney's song and these country singers' song, other than the obvious phrase. But if someone released a song called "I Love You", would we accuse them of ripping someone off (because that title has been used a million times before)? No, probably not. I remember when "I Kissed A Girl" came out and people accused Katy of copying that 90's song with the same title, but there were really no similarities. Just because a title/phrase is the same, doesn't mean it's a rip-off. Plus, even if it was, you can't accuse Britney of anything since she didn't write the song.